There is a Old Marvel Star Wars Comic with Mandalorians fighting in the Clone Wars it is one of the oldest representations of the Clone Wars with the Mandalorians Shysa Dala and Spar fighting in the Clone Wars did you think Lucas saw that image and saw 3 characters similar to Boba Fett that he decided to make the Clones in Boba Fett Dad Clones for his Prequels Movies? Lucas was fan of Comic Books so it would not be strange to think that he was inspired by that representation of the Clone Wars of the Marvel Comics i also think he was inspired by Tales of the Jedi and Dark Empire Comics for the Prequels supposedly George helped in the creation of Tales of the Jedi