Hard to tell, right? Plus, no two fish are exactly identical, at least as far as I can tell.
@Johnsfolly I like how they all seem to have that blue line in front of, and under, the eye.
The Texas and at least some east-coast populations should be the same... Redbreast aren't native to Texas, they were transplanted there. At some point, the Texas fish will probably genetically diverge, since they can't interbreed with the original populations. I dunno how long that'll take...?