Does anyone know if the water pump pully (assembly with fan clutch) is the same as the 240z-280z?

I have a broken fan blade on my 620 and I can't find a replacement fan. But ebay seems to have tons of 240z fan blades, so I bought one. But then I found out that the mounting holes don't align. So I was wonder, if I change out my whole water pump assembly, fan clutch and all, if the alignment of the pully is the same as the 620. Someone told me that the belt groves not match up. I'd rather ask questions first before pulling of the parts and buying new parts, just to find out that my solution wasn't going to work in the first place.

Thanks
-k

Lots of parts from the L series engines were swappable. I would imagine the water pumps would be swappable across the entire L series family.