But since they're pretty much the same. Exact. Friggin'. Trait, we can probably draw the conclusion that it'll work the same.

Highlander is not an official format, so the only answer is "ask your judge."

Are the tracer tokens specific to the one figure that distributed the token?

If I have two Mk1's and the first one gives an opponent a tracer token, does the second Mk1 get the benefit when attacking that opponent?

The power only looks for IF the target has a tracer token, not where it came from. So your second Ultron should benefit from one placed by the first.

Where I play we don't do points, just play until one side is entirely gone.

So, if I started out with 4 of these at 65 points and one at 120, the only way I could lose is if I rolled a crit miss on the last click on the 120 point one, right?

Or, if I took mystics damage while on my last click on the 120 point piece, right?

Or, if I was poisoned while on my last click on the 120 point piece, right?

Did I miss anything?

If I were judging, and someone asked if Ultron Mk 1 here is restricted by the Highlander rule, my answer would be: "You may have one copy on your force to start the game, and on one the map at any time, but may have multiples in your sideline." It's the first (and damaged) vessel for the Ultron AI - so he'd be the only one you should have in regards to an Ultron character, but can be replaced by other Ultrons in different situations.