They are meant to be printed with a multimaterial unit (MMU, palette, toolchanger…), however, the colour changes only happen the first two layers and then is just the ball, so using a method for multicolour printing with manual changes for those without access to a multimaterial unit is quite feasible.

Loading the 3mf in prusaslicer will display every body with the colour needed (in the body name since the model is not prusaslicer proyect)