Free dex/merc it is!
Now, I have a question about bushings because I just got my new rebuild kit and I'm either going to change the bushings or keep the one's already installed. The problem is they are two different kinds of bushings and I don't know which are better... Both are new just one set was installed by the previous builder...
Measure the clearance between the existing bushing and the reaction shaft support journal.
Then install the new one and measure again. Next time you will know what is acceptable and what’s acceptable.
As for differences - all I can see is the new one has a narrower groove. Either would be fine.
Really do I see this bushing bad unless a high mileage unit that ate a lot of very fine debris that got through the filter, of if someone installed one of those junk brass scree filters.
I see you are going through the front clutch looking for a reason for no reverse from your other post. Make sure to check the two metal rings on the reaction shaft support for condition, etc. and there are two lip seals in the clutch - lots of guys miss the small inner one inside the retainer.