Actually it seems to be more based on when the mould was released in terms of the practice that is used. Anything from Ultra Magnus onwards seems to be a separate figure whilst anything older seems to use the letter suffix on the original release.Originally Posted by MEEEGGGAAATTTRRROOONNN!!!
Case in point, derivatives of Sideswipe, Bumblebee, Soundwave, Starscream, Convoy 2.0, Rodumus Convoy and Streak, all use letter suffixes for different versions of the mold; even when they're major characters. However with anything from Ultra Magnus onwards, the practice appears to have changed so that the different versions get their own number. Loudpedal is the one exception to that, however as it was a TTS exclusive, that might be why.
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