Are you certain you can trust the place you bought it from not to be some kind of look-a-like that looks great in finish, but maybe was off in tooth pitch?

Never found a bargain for bike parts on Amazon. If I did, I'd be leery of what I was getting. If you paid normal markup, then it's probably trustworthy.

I'd have to believe the original stuff you have is probably correct. Chains are pretty standard things. The difference in pitch is going to more on the order of .25" or maybe .125". So you'd know quickly with even the most inaccurate ruler you can find, if the chain is wrong.