Yep those are two differant engine kits but they will both work. Something to think about is where you intend to use them is the country hilly or flat.
Ask for the rear sprocket to be 44 or more teeth on the back for very hilly areas. I have a 50 tooth rear sprocket and if I could get the bike to stick to a tree I think it would climb it with no problems.
Roller bearing idler is a nice touch.
415 chain seems to me to be good
a good clutch lever with locking button. The steel ones are not as good as the aluminum ones.
some of the things I'd look at.