Problem again (regarding loop): how to compare certain part between files

[yamaha102]

i got 2 INI file (file1 and file2), i wish to compare the specific part of the file, below the compare part only true if file 1 and file2 have an identical line data. (mean line7(aaa=...) of file1 must same as line7(aaa=...) of file2)

if line7(aaa=...) but file2's line 7 = [DEF] ... it will show the content of aaa is different.



File1:
[ABC]
aaa=1
aab=2
aac=3

[DEF]
aaa=13
aab=24
aac=3

[GHI]
aaa=1
aab=24
aac=35

File2:
[ABC]
aaa=17
aab=2
aac=3

[DEF]
aaa=13
aab=33
aac=35

[GHI]
aaa=1
aab=24
aac=35