The version of the FoV mod doesn't matter as long as it works with ArcheAge 2.9 you will be fine.
To explain it a bit.. The script you're running to give you a larger FoV is taking the game_pak file and modifying the config.ini which used to be sepperate back when ArcheAge launched but then to stop cheaters n such they integrated it into the game_pak file.
The difference of FoVmod version just changes where in the game_pak file it looks for the config.ini that's all. You wont get banned or anything for using a different version it just wont work if it's not 2.9 compatible.