Thanks guy's for your help.
I just measured the shaft size and number of teeth on the gear and they are both the same.
cheers

But wait there's more!

Do most A15 motors run the clutch type fan
as both my A15 motors have these.
I assume they would as the waterpump and pulley are different.
Would these give the motor a couple of more horsepower as the waterpump isn't driving it constantly, and keep the motor cooler as it has a few more blades?

Thankyou all.