I think under the new rules its a change of engine family.... 4G93 to 4G63 and it needs to be looked at.
It never used to be in the past as Jamo mentioned, its only a 200cc increase in engine displacement, but check anyway.
Yes, definitely will need engineer cert for 5 stud conversion (different hubs).
Everything costs money but we've used this guy before to engineer my brother's AWD 4G63T coupe, so 4G63's into a GSR will be no problem: