It doesnt matter if the fs and main are different.
i flashed mine with fs r1bc002 and main r1bd001 and i dont have any problems.
Well i do, sometimes when i wanna turn on my phone the white screen appears after the welcome screen and it turns on after a few secs, but its not because of the firmware, its just cause of some elf.





Edit: sorry about hidden info, im not sure what text is important