Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Nokia X family
Table title:
Model comparison
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th class="highlighted"  colspan=1 rowspan=1 > Nokia X </th><th class="highlighted"  colspan=1 rowspan=1 > Nokia X+ </th><th colspan=1 rowspan=1 > Nokia XL </th><th colspan=1 rowspan=1 > Nokia X2 </th><th colspan=1 rowspan=1 > Nokia XL 4G </th></tr>
<tr> <td colspan=1 rowspan=1 > Screen </td><td colspan=1 rowspan=1 > 4 in (10 cm) IPS LCD, 800 × 480 px </td><td colspan=1 rowspan=1 > 4 in (10 cm) IPS LCD, 800 × 480 px </td><td colspan=1 rowspan=1 > 5 in (13 cm) IPS LCD, 800 × 480 px </td><td colspan=1 rowspan=1 > 4.3 in (11 cm) IPS LCD, 800 × 480 px </td><td colspan=1 rowspan=1 > 5 in (13 cm) IPS LCD, 800 × 480 px </td></tr>
<tr> <td colspan=1 rowspan=1 > RAM </td><td class="highlighted"  colspan=1 rowspan=1 > 512 MB </td><td class="highlighted"  colspan=1 rowspan=1 > 768 MB </td><td colspan=1 rowspan=1 > 768 MB </td><td colspan=1 rowspan=1 > 1 GB </td><td colspan=1 rowspan=1 > 1 GB </td></tr>
<tr> <td colspan=1 rowspan=1 > Internal storage and included microSD card </td><td class="highlighted"  colspan=1 rowspan=1 > 4 GB internal Up to 32 GB MicroSD card support </td><td class="highlighted"  colspan=1 rowspan=1 > 4 GB internal Up to 32 GB MicroSD card support, 4 GB card included </td><td colspan=1 rowspan=1 > 4 GB internal Up to 32 GB MicroSD card support, 4 GB card included </td><td colspan=1 rowspan=1 > 4 GB internal Up to 32 GB MicroSD card support, 4 GB card included </td><td colspan=1 rowspan=1 > 4 GB internal Up to 32 GB MicroSD card support, 4 GB card included </td></tr>
<tr> <td colspan=1 rowspan=1 > Rear camera </td><td colspan=1 rowspan=1 > 3 MP fixed focus </td><td colspan=1 rowspan=1 > 3 MP fixed focus </td><td colspan=1 rowspan=1 > 5 MP, autofocus and LED flash </td><td colspan=1 rowspan=1 > 5 MP, autofocus and LED flash </td><td colspan=1 rowspan=1 > 5 MP, autofocus and LED flash </td></tr>
<tr> <td colspan=1 rowspan=1 > Front camera </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2 MP </td><td colspan=1 rowspan=1 > 2.0 MP </td><td colspan=1 rowspan=1 > 2.0 MP </td></tr>
<tr> <td colspan=1 rowspan=1 > SoC </td><td colspan=1 rowspan=1 > Qualcomm Snapdragon S4 MSM8225 1 GHz dual-core </td><td colspan=1 rowspan=1 > Qualcomm Snapdragon S4 MSM8225 1 GHz dual-core </td><td colspan=1 rowspan=1 > Qualcomm Snapdragon S4 MSM8225 1 GHz dual-core </td><td colspan=1 rowspan=1 > Qualcomm Snapdragon 200 MSM8210 1.2 GHz dual-core </td><td colspan=1 rowspan=1 > Qualcomm Snapdragon 400 MSM8926 1.2 GHz quad-core </td></tr>
<tr> <td colspan=1 rowspan=1 > Networks </td><td colspan=1 rowspan=1 > GSM 850 / 900 / 1800 / 1900 WCDMA 900 / 2100 </td><td colspan=1 rowspan=1 > GSM 850 / 900 / 1800 / 1900 WCDMA 900 / 2100 </td><td colspan=1 rowspan=1 > GSM 850 / 900 / 1800 / 1900 WCDMA 900 / 2100 </td><td colspan=1 rowspan=1 > GSM 850 / 900 / 1800 / 1900 WCDMA 900 / 2100 </td><td colspan=1 rowspan=1 > GSM 900 / 1800 / 1900 WCDMA 850 / 900 / 2100 TD-SCDMA band 39/F (1880-1920 MHz) TD-LTE bands - 38 (2570-2620 MHz),39 (1880-1920 MHz),40 (2300-2400 MHz) </td></tr>
<tr> <td colspan=1 rowspan=1 > Dimensions </td><td colspan=1 rowspan=1 > 115.5 x 63 x 10.4 mm </td><td colspan=1 rowspan=1 > 115.5 x 63 x 10.4 mm </td><td colspan=1 rowspan=1 > 141.3 x 77.7 x 10.8 mm </td><td colspan=1 rowspan=1 > 121.7 x 68.3 x 11.1 mm </td><td colspan=1 rowspan=1 > 141.3 x 77.7 x 10.8 mm </td></tr>
<tr> <td colspan=1 rowspan=1 > Weight </td><td colspan=1 rowspan=1 > 128.66 g </td><td colspan=1 rowspan=1 > 128.66 g </td><td colspan=1 rowspan=1 > 190 g </td><td colspan=1 rowspan=1 > 150 g </td><td colspan=1 rowspan=1 > 190 g </td></tr>
<tr> <td colspan=1 rowspan=1 > Battery life (on standby) </td><td colspan=1 rowspan=1 > 2G = Up to 28.5 days 3G = Up to 22 days </td><td colspan=1 rowspan=1 > 2G = Up to 28.5 days 3G = Up to 22 days </td><td colspan=1 rowspan=1 > 2G = Up to 41 days 3G = Up to 26 days </td><td colspan=1 rowspan=1 > 2 SIM cards = Up to 23 days </td><td colspan=1 rowspan=1 > Up to 37 days </td></tr>
<tr> <td colspan=1 rowspan=1 > Battery life (talk time) </td><td colspan=1 rowspan=1 > 2G = Up to 13.3 hours 3G = Up to 10.5 hours </td><td colspan=1 rowspan=1 > 2G = Up to 13.3 hours 3G = Up to 10.5 hours </td><td colspan=1 rowspan=1 > 2G = Up to 16 hours 3G = Up to 13 hours </td><td colspan=1 rowspan=1 > 2G = Up to 10 hours 3G = Up to 13 hours </td><td colspan=1 rowspan=1 > 2G = Up to 15 hours 3G = Up to 11 hours 4G = ? </td></tr>
<tr> <td colspan=1 rowspan=1 > Operating system </td><td colspan=1 rowspan=1 > Nokia X 1.x software platform (AOSP 4.1.2) </td><td colspan=1 rowspan=1 > Nokia X 1.x software platform (AOSP 4.1.2) </td><td colspan=1 rowspan=1 > Nokia X 1.x software platform (AOSP 4.1.2) </td><td colspan=1 rowspan=1 > Nokia X 2.x software platform (AOSP 4.3) </td><td colspan=1 rowspan=1 > Nokia X 1.x software platform (AOSP 4.3) </td></tr>
</table>
Question:
What is the difference of RAM and storage between Nokia X and Nokia X+?
Answer:
Two variants, the Nokia X and the Nokia X+ were released, with the Nokia X+ having 768 MB RAM as opposed to the 512 MB RAM, as well as a microSD card included in the box.