https://mods.factorio.com/mod/metal-and-stars/discussion/6805620f14d9a73822771bc0
Basically, metal and stars also adds neodymium as an ore, and well so does your mod. They're using common prototypes on it, but if you'd also integrate common prototypes we could have the same neodymium for both planets.
Basically you both add different neodymium, more on this in the link above.
