IAH-GVA on B-777-200ER, B767-400ER and B757-300.

SeatGuru does a great job of providing better info than the CO seat map. However, there the above aircraft have different versions and SeatGuru says "Vers. 1" or "Vers. 2", etc.

Is there any way to find out from CO which version of aircraft I will be on so I can chose the right seat map?