Hi Aucky! Not sure about Argentina, but Chile is fairly easy. You can get a six month convalidation by taking a 100 question test on local aviation regulations. It is pretty easy, the questions are published on the D.G.A.C. website. The complete convalidation, requires you to take specific tests on each subject following the same procedure. It should not be too hard and it doesn't take more than a week. Lovely country to fly and very nice people!! As for the pay, I'm not sure, but I would guess it's not good. Helicopter market growing fast. Hope it helps.
Cheers!