Mechanical Fan Interchangeable?

[MikeyMan]

Are most small block mechanical fan & clutches interchangeable?

I've got 2 fan w/clutch setups, but don't know which was which

One is off an 84 Olds 307, and the other from my truck.
Truck is a 72 C/10 non A/C, but motor a late 70's 350 w/TH350 trans. Truck did not have a shroud when I got it, but I do have one I may or may not use.
I'm finally putting the truck back together after several years in pieces. Nothing special, just a stock daily driver.
So there's the two fans in my parts pile: One is a 6 blade that looks real similar to my 71. However, one of the blades is slightly bent and the fan seems to rub the shroud opening. The other is a 5 blade, and clears the shroud nicely. Both fan clutches are in good shape.

I'm going to use the 5 blade because it's in better shape and will clear the shroud if I decide to use it. I think this might have been the Olds 307 fan.

Is it OK to mix or swap small block mechanical fans?