What Engine for my RT4W?

So I'm pretty new to the whole Honda civic wagon and anything dealing with imports but, want to learn and pick up a new hobby. So here are my Questions:Whats the difference between a d16y7 and a d16y8?

And which of those two motors is easy to swap into my RT4W? P.S. I wanna keep my AC

I'm on a budget and of course live in CALI. so no advise about a ZC swap plz. . . THANKS
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