Super Jet Using spare pump with worn driveshaft?

n20si

baller on a budget
Location
Cosmopolis,Wa
Well I bought a solas pump for my rn from impros. Sent them my pump and driveline to assemble and wont be back for another week. We are having some of the best weather I have seen in ever here in wa and a buddy has a spare pump I can use but the driveshaft has some worn splines on it. Well about 3/4 of the splines on the shaft are half the size they should be the other 1/4 are perfect due to the overlap. My midshaft is perfect and am wondering if using the spare setup will do damage if I use it for a ride this weekend?
 
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