depends on the differences between them the biggest one is going to be compression, if you were tuned on an old tired motor you may end up with detonation on the new one due to it having tighter rings. If the tune was mad when your current motor was still fresh it won't be that far off. I would say swap them, drive it easy and break it in, then go in for a dyno pull just to have them make sure it isn't doing anything it shouldn't be.
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