Hmmmm.
I just googled the manufacturers id, "SMC 342 MICHIGAN",
took about 5 seconds.
Michigan Wheel Propeller SMC 342 14x17 3 Blade
And you said the blades looked bigger.
So may not be the same prop design as your 14 x 15 in example one.
Now go test them out, comparing WOT rpm, gps speed...