Question [Q] efs format and cm/aosp rom

Hi, do roms based on aosp/aokp change the format of efs partition after 4.1.2 build? (from efs v1 to v2), and does modem patch, like ariza work on them?

I am asking because i'd like to try some cm based rom's but i can only patch 4.1.2 rom's (i have messed up efs/modem).

Thx in front.
Flying with Galaxy S3 i9300 on XXUGND1 with Boeffla Kernel v5.2