I think it's gonna be hard to tell from those pics. it looks like the camera is distorting the coloration....or perhaps its the tank lighting. the barred varieties of amphilophus can be hard enough to determine from each other without picture coloration issues. from the pics I'd say it could be amarillo but hog is definitely a possibility too. Hogs and red isletas are going to be the more likely to have the red on the abdomen area of the fish.