I think 1zz is already present in new Altis, that won't b a problem at all. problem arise with replacing a 2nz with a 2az.
better idea wud b swap engine of ur cohice n keep stock one with u,so wen u sale off car,put it back in n take swaped one out.best bet i think u can play!market of car wont go down cuz original engine will b evry less used by tht time!
Please ye zulam mut karna....
All the best!!!!!