That's not true! Those ARE the ESB Hero studs taken from the Pre-Pro #3 suit:
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Note that the second image is from my Boba Fett Suit Fact Files thread.
In a way or other, the Pre-Pro #3 suit is the bonding link between the Pre-Pro #1 and ESB Hero suits. The Pre-Pro #3 has the same gauntlets and jetpack from the Pre-Pro #1 suit, while the ESB Hero has the soft parts and the shin tools from the Pre-Pro #3 suit. The main link between these suits is the same color scheme used on the armors and helmets (especially the Pre-Pro #3 and the ESB Hero).