99 lumina engine into a 97??

I am planning on replacing the original 3.1 motor in my 97 lumina with a used 3.1 motor due to a broken camshaft.

My question is what years are compatible? I know in 96 they switched to the newer rocker arms, but will a 99 lumina 3.1 work, or is that a different style?

thanks in advance
Nathan

Should be ok, but any salvage yard has this info at hand.