Are Proform and Flex-A-Lite interchangable?

My fan blades on my Proform 15" electric fan recently came apart. Rather than buying a new fan, I see Flex-A-Lite makes replacement blades for there 15" fan running about $30. Both fans look identical. Is it possible to drill the rivits out, remove what's left of the old blades, and install Flex-A-Lites replacement blades using rivits or small nutts and bolts? Any input would be great on this. Really would save some money to.

The dimensions seem to pretty similar as well.

Being that the proform had no balance to it, was just rivited onto the fan motor, I think as long as the mounting platform off the fan motor is the same I'll be good to go.