This is all speculation on my part so take it for what it is worth.
Mine was advertised as for MD and MnM but came with the MD samples pre-loaded. I saw some talks on the old elektron-users forum about using the same +Drive in either unit and they were saying it will work but I don’t remember seeing an update on if it worked.
I feel like the architecture between the two units is the same in the regard for kits and how memory is managed and I do believe it is the same +Drive for either. If you do end up with a +Drive that has the MD snapshots pre-loaded, I have no idea how an MnM will handle this. I would say not well. If it does boot up fine then just simply formatting the +Drive should be enough to make it usable on an MnM. However I would suggest contacting Elektron first. Maybe install it in an MD, format, then install in the MnM. But my MD did some sort of updating when the +Drive was installed. Does this revert back once the +Drive is missing? I don’t know.