Yes, I don't think there are any chinese algae eating shrimp. Amanos are from Japan, and considering bettas are called many different names, inlcuding chinese and japanese fighting fish, I wouldn't be surprised if Petsmart got the name mixed up.
If you feed 'em algae wafers now & then, spread 'em out or the Amanos will outcompete the cherries, pushing them tight off... Cherries are busy, but Amanos are busier & larger.