The same knife but different?

So for Christmas I got a full immunity but I already owned one. I was just gonna exchange it but I noticed they are different. The one on the left is from REI and the one on the right is from an online retailer called knivesandtools. I noticed the one from knivesandtools was lighter blue on the handle and the butterfly was a bit bigger and looked a tiny bit different. The pivot isn’t as smooth either. Anyone know if it’s just because it’s newer or one of them is fake. If so please tell me which one.