I've just copied the aircraft folder for Lanc 'G for George' from my AvH collection to ETO, picked a load of 500lb bombs and took her for a flip. All I did was delete the .bdp file from the aircraft's folder before starting ETO, didn't bother about weapons or effects - ETO uses the latest AvH and compatible weapons and effects. Don't see any problems??
The cockpit in the ETO Lancs are newer and much better detailed - NachtPiloten's work iirc.