prop size

[Wooden Walley]

I have a f 150 now that is replacing a f115. I have a prop left over from the f115 and from eyeballing it, it does not appear that the old prop will fit the new motor. Is the f150 hub bigger? I have not taken the prop off, but it sure looks bigger.

I thought they were the same size in years past, but apparently I'm mistaken.

Thanks,