This is actually a good fight. Both are masters of subversive combat. I could see either taking the other down, but not after a very long, lengthy, boring, silent, and pretty much non-active fight.
Basically the character that walks into the other characters trap/ambush takes the fight.
Since both characters have massive stealth combat training, the victory could easily go to either IMO.
Well, I simply see the 2 characters as very evenly matched. Both are masters of stealth, H2H, info seeking, and experts with weapons (obviously guns are Pun's prefferred,l while Gambit proficient with staff's/swords, throwing weapons and some such). But Gambit has been depicted to be fast enough to deflect machine gun fire with the use of his staff, so I'd say it would be a fight no matter what the circumstance.
The fight would go to the combatant who is the most familiar with his environment.Since this is a jungle, Pun takes this 6-7/10, but were it a bayou or even a city, Gambit might have the same advantage.