where i live, RES and eastern painted turtles live in a pond behind my job. so i guess they eat the same things, i even see them sitting on the same logs together. i had both turtles in my care and i fed them both the same turtle pellets and they did very well, but if you read up on them, even though the red ear slider gets bigger it is recomended that you give the painted turtle more space, so i guess there are some differences, but the lighting and temps and food is all the same.