If I may, I can explain the height differences in the characters. In the Republic Commando/ Imperial Commando book series (I know is no longer canon, but it still is to me) there is a mention of why Jango is so short. When he was growing up on a farm on Concord Dawn, he and his family weren't exactly well off. There were times where they couldn't afford proper nutrition. And since he didn't get enough proper nutrition as a child, he didn't really grow to his full height potential. But since Boba was "born" or should I say "hatched" on Kamino, he had the exact nutrition he needed as a young child, so he and his Clone brothers were able to grow to their full height potential. So see, the height difference was acknowledged. And Tem could totally play Boba despite his stature. These days, they could use certain techniques when filming to make him appear taller if they wished. ;-)
I bet my money on the blond-haired kid. Somebody bet on the Dug.