Zan ZSA15B ovn fan mtr = Belling/Hpt/etc. same but cheaper?

3581913773 original pt. no. £19 @ Masterpart or
5031683028079 £20.79 @Connect.
Type Plaset 54879.
The blade, only available seperately, has 7 fins on the ZSA15B cooker I’m to fix.
There are several similar looking motors with the same Plaset no. though included fan and half the price. E.g. ELE9128 @ Connect. These are listed for Belling, Hotpoint etc. Most have only six fins. Does anyone know if they’ll fit? Is the shaft length the same?
Sorry to be penny pinching but I just can’t stop myself. It’s a habit I got into in the days when money was hard to come by. 😆
Mike.