I agree that one may have a 325 sprocket.Make sure you don’t have .325 sprockets on there as well.
They are both 50cc saws I believe. Most 50cc don’t come with standard 3/8 chain from the factory. I’ve boogered good chains that way in a moment of haste myself.
Both those saws are typically set up with 3/8x72dl from the dealer.
With outboard clutches you put the chain on first and spin it a bit to check the fit, you can feel it if its wrong and your paying attention. Many times people dont even know there is a difference, when I first started cutting I had some problems with narrow kerf chains, all the numbers were right lol.