The left is pseudemys rubriventris or chrysemys picta sp. more pictures would be helpful. But I think it is chrysemys picta belli.
The right one could be pseudemys concinna or floridana where are you from?
The left looks like a painted turtle, I think the head is too colorful for a cooter.
Could we ave some beauty pictures of the plastrons, please?
I agree, the left looks like a coastal plain cooter, but the shell is very light??