Paint job on both Dukes is great.
The knife on the leg is a great detail, i didn't noticed it! (i never had arah Duke)
I'm not really sure about the "skirt" you've kept of Recondo, but while I was working on my Duke (too!) I realized the green on his collar is a underneath green shirt, making the tan part not a shirt but a sort of jacket (call me obvious, but it's not that easy to note on pictures), I guess is because Duke was designed as a Hawk replacement. So, the skirt actually makes sense and separates him a bit of Hawk. *thumbs up
Jungle Duke makes more sense with bloused pants, true. personally, I prefer the loose pants just for variety, but yours look great, the paint is spot on.
If i'm correct, the left leg doesn't get completely straight (because the shape of the knee), I think you can correct this by swapping the knee pieces (left knee on right leg, and the inverse) if I recall correctly (had the same issue before).
I'm definitely stealing some ideas!