Oil Pump re-use/substitution

[Swann, Benjamin R. (BSWANN)]

As I was in the process of putting the NG motor back together, I noticed
that the oil pump housing had a small but probably critical crack in the
relief valve portion.

So, off came the pan.   I removed the oil pump.  I fortunately have the 3
extra motors, and snagged a pump off of the KM engine - I think that's what
it is  - looks like any other I5.

I'm wondering if there should be any concern with using this pump.  I
cleaned it up, but did not disassemble.  It seems to spin freely with  no
resistance or grinding.  Do these things go bad?  Is there any reason that I
shouldn't use this pump?  Should I open it up and inspect, or am I more
likely opening a can of worms, and if it feels OK then it probably is?

TIA fot the replies.

Ben