A while ago, the standard Stacker and Platformer sprites for default lemmings in New Formats were changed: Where once they used to look exactly like Builders, the Stacker now moves the bricks over his shoulder "horizontally", rather than in a curve, and the Platformer is on his knees when platforming, like in Lemmings 2: The Tribes, rather than walking on his feet, like the Builder.
However, the X-Mas sprites, for example, still use the old animations, as far as I can tell?
I'm not sure about GigaLem's Freedom Planet sprites, which are, apart from the X-Mas sprites, the only sprites I am aware of that aren't mere re-colourings, but have a distinct shape.
Any of the re-coloured sprites will most likely have the new animations for Stackers and Platformers already, because they work off of the default sprites.