Originally posted by Hand87_5
Do you know if both engines have to be the same type?
Maybe because of the computers…

Ordinarily yes. But Apparently Boeing are designing a system that will allow you to change the manufacturer type on the engines on a 7E7 with a system of pre programmed plug in modules for the flight deck and avionics. This will allow an initially Rolly Royce powered 7E7 to be converted to say GE powered with all the eletrics and panels configured for it within 24 hours

At the moment that process take longer as systems have to be replaced, reprogrammed and configured.

This would make the job of selling on a 7E7 much easier.