Transmission guys, question and picture

CDNTX650

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Alright, 3rd gear needed to be replaced on the gear set I want to use, so I took one from another set I had. This is what 3rd pinion looks like against 4th pinion. Should I be replacing as a whole set? 4th pinion on the other set had a very rough look to the top of gear teeth facees, or does that not matter? Not sure of casting, rough or maybe chewed up..nothing else looked chewed up. even that 4th pinion feels gritty...

This third, looked like it has the better dogs on the other side.
 
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