Hi Trish,
I'm glad to help here! The Smok ARO Pyrex BCC and the Smok Micro Core ADC II are very similar, but the Micro Core ADC II offers airflow control (allowing you to control the tightness of your draw), and the design of the coils is also different. I'm posting the link to the replacement coil heads for each clearomizer below.
http://www.smoktek.com/Smok-Replacement-Bottom-Coil-Head_p_940.html
http://www.smoktek.com/Replacement-Bottom-Dual-Coil-Head-for-Micro-Core-ADC-II_p_1185.html
Best regards,
Brad