(It's whatever looks good on Boba Fett in film at the moment.) While the fans are very detail oriented, in regards to the differences between the ESB and ROJ armor, this may not be the case with the ILM employees or Lucasfilm's wardrobe department employees.

To them, Boba Fett looks the same irregardless of whether he's wearing ESB or ROJ armor. I don't think the game designers, or the ILM people notices or are really concerned regarding the differences of the ESB or ROJ armor.