Iirc if using the subgroup’s own compressor there won’t be any coherence issues between the two subgroups. If using inserts for your fx then one path will be more delayed than the other. There is no automatic delay compensation.
The only live desks I’ve seen that do any sort of automatic delay compensation when you use inserts are the Midas Pro series and Yamaha Rivage PM10. Ilive doesn’t, GLD doesn’t, and I don’t think I’ve seen any advertising about dlive doing it.