[Samsung Galaxy Ace Plus S7500] ctcx:
We re-checked ramdisk and defconfig differences with original stock roms this time, or we think so.

RAMDISK

I'm parting from what we first posted in order to save me text.

default.prop files have NO DIFFERENCES at all.

init.rc has the very same differences, with some additions:

[B]S7500:[/B]
mkdir /data/misc/radio 0775 radio [COLOR="Red"]system[/COLOR]
[B]S7500L:[/B]
mkdir /data/misc/radio 0775 radio [COLOR="Red"]radio[/COLOR]
[COLOR="Red"]chmod 0775 /data/misc/radio[/COLOR]

[B]S7500:[/B]
mkdir /data/local 07[COLOR="Red"]71 shell shell[/COLOR]
[B]S7500L:[/B]
mkdir /data/local 07[COLOR="Red"]51 root root[/COLOR]

init.qcom.post_boot.sh also has differences:

[B]S7500:[/B]
(non-existen line)
[B]S7500L:[/B]
# Latin System Dongc100 2011-1222 for adding case of S7500L model name

[B]S7500:[/B]
target=`getprop ro.product.device`
case "$target" in
"GT-S6202"| "GT-S7500" | "GT-S6500" | "GT-S7509" | "SGH-I827" | "msm7201a_ffa" | "msm7201a_surf" | "msm7627_ffa" | "msm7627_surf" | "msm7627a" | \
[B]S7500L:[/B]
target=`getprop ro.product.device`
case "$target" in
"GT-S6202"| "GT-S7500" | "GT-S[COLOR="Red"]7500L" | "GT-S[/COLOR]6500" | "GT-S7509" | "SGH-I827" | "msm7201a_ffa" | "msm7201a_surf" | "msm7627_ffa" | "msm7627_surf" | "msm7627a" | \

[B]S7500:[/B]
case "$target" in
"GT-S6202" | "GT-S7500" | "GT-S6500" | "GT-S7509" | "SGH-I827" | "msm7201a_ffa" | "msm7201a_surf" | "msm7627_ffa" | "msm7627_surf" | "msm7630_surf" | "msm7630_1x" | "msm7630_fusion" | "msm7627a" )
[B]S7500L:[/B]
case "$target" in
"GT-S6202" | "GT-S7500" | "GT-S[COLOR="Red"]7500L" |"GT-S[/COLOR]6500" | "GT-S7509" | "SGH-I827" | "msm7201a_ffa" | "msm7201a_surf" | "msm7627_ffa" | "msm7627_surf" | "msm7630_surf" | "msm7630_1x" | "msm7630_fusion" | "msm7627a" )

[B]S7500:[/B]
case "$target" in
"GT-S6202" | "msm7627_ffa" | "msm7627_surf" | "GT-S7500" | "GT-S6500" | "GT-S7509" | "SGH-I827" | "msm7627a")
[B]S7500L:[/B]
case "$target" in
"GT-S6202" | "msm7627_ffa" | "msm7627_surf" | "GT-S7500" | "GT-S[COLOR="Red"]7500L" | "GT-S[/COLOR]6500" | "GT-S7509" | "SGH-I827" | "msm7627a")

There are other 3 different files: ueventd, GT-S7500.rle, and init. But I couldn't compare them, Meld says it cannot compare binaries.

DEFCONFIG

Far much less differences found.

[B]S7500:[/B]
CONFIG_NF_CONNTRACK_SIP[COLOR="Red"]=y[/COLOR]
[B]S7500L:[/B]
[COLOR="Red"]#[/COLOR] CONFIG_NF_CONNTRACK_SIP [COLOR="Red"]is not set[/COLOR]

[B]S7500:[/B]
CONFIG_NF_NAT_SIP[COLOR="Red"]=y[/COLOR]
[B]S7500L:[/B]
[COLOR="Red"]#[/COLOR] CONFIG_NF_NAT_SIP [COLOR="Red"]is not set[/COLOR]

[B]S7500:[/B]
[COLOR="Red"]#[/COLOR] CONFIG_MSM_KGSL_DISABLE_SHADOW_WRITES [COLOR="Red"]is not set[/COLOR]
[B]S7500L:[/B]
CONFIG_MSM_KGSL_DISABLE_SHADOW_WRITES[COLOR="Red"]=y[/COLOR]

For defconfig files we used defconfig from S7500 stock rom from SamMobile vs defconfig file I uploaded.

For ramdisk files we used boot.img from S7500 stock rom from SamMobile vs boot.img from S7500L stock rom from SamMobile as well.

I downloaded my own corresponding stock rom from Sammobile for the boot.img comparison since I had an ugly issue with CWM for my device and I had to switch back to stock recovery, which has no backup function.