This is really bad advice considering injector size, base fuel pressure, turbo dynamics, and a handful of other differences between the two will cause issues for tuning or at the very least will require porting calibrations in order for it to even run proper.
Just wanted to point out, that when DC crossflashes, 1.8t AUM should also work and they are well defined. Which then would make it easier for him, then finding maps by himself.
Of course it is not "flash and go", this would only be the case when he gets a matching definition.