This is just wrong!

Not about being a purist........... would you wear 2 different color socks?
:-|

That's not remotely a good comparison. Maybe fair if it had mismatch wheels on the pass/driver side. Wearing mismatched socks makes you look like a hobo. A different engine swap looks fine from the outside, but a handful of people will nitpick the details.(such as yourself)

If you want to do a clothes comparison its like asking would i go out wearing pants that are from a different company than my shirt. And to that i say: Of course i would.