Don't really see your point, even in that Clone Wars picture you can see Rex and Cody have different hairlines. Not all clones have the same hairlines. Plenty of examples of this in the Clone Wars. Rex is clearly receding more than Cody. Also, one is based off a live-action version of a character (Cody) and other is a realistic interpretation of an animated character (Rex). Unnecessary nitpicking.
The difference between live action and animation is not as forgiving when they're literally
clones of the same age, thanks to that we already know 95% of how Rex should look in live action.
As for claiming that their hairlines are different in this example picture, it's the
exact same distance from the brow and wrinkles, you can match up the forehead wrinkles in the exact same places. Take a measuring tape to your screen if you can't figure it out, the hairlines are identical:
That's the same hairline both times in different colors. Cody keeps his longer and natural, Rex trims his short and dyes it. What
other clones of different ages or experiences have done with their hair is irrelevant, that's what
these two clones clearly share.
When a figure costs hundreds of dollars you can bet I will pick nits! Rex's hairline being at least a full inch higher on his fivehead is a pretty big incongruence that you shouldnt need an eye for detail to notice! Just imagine the ****show if Hot Toys released a Stark like that...
You'd be totally down for that stark sculpt? Or is that nitpicking