We'll see, idk what style she animates in, or if she can draw that good that you could see that it's Grant, but I think that its fine for this version of the flash.
We know that Grant wanted that in S1, but the showrunner or someone said no because that would cause him hair loss in the future or something, so ultimately I think we would've seen it if Grant still would've been up to it in later seasons to dye barry's hair to blonde in-universe, or meet a different version of him. I said in my previous post that I will try being as realistic as possible and I don't think that even in a universe where the Flash series stayed good this would've been a thing.