Differences in clutches?

#1
I put the clutch off the engine I took off a go kart I bought and put in on my mini along with the engine. Should I have used the clutch from the previous engine? I have not put them side by side yet to look at #'s on them yet. This is a from the recliner ?.
 
#2
Unless your using racing clutches don`t worry they are all pretty much the same , some might have a different number of teeth on the clutch and engage at different rpms but you will be fine.
 
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