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I've heard from somewhere that normally Toei has 2 versions of most rider suits, one for close ups during filming, and one for fight scenes. It's why Night Rogue sometime has a black under suit in some scenes of Build and then a brown one in others.

So it's likely they repainted one of the Poppy suits' armor, but still have the other for the special.

Also, the four long bits hanging off Jeanne's back are parts of Neohi Magia from Zero One.