More multisample patches at a time

[Gertje]

Upon rediscovering (yay!) my trustworthy and venerable Fantom X, I finally got me a memory card and sufficient RAM, and loaded in the fine LJ Rhodes by Cesarsound.
The question rises: hoe do I add another multisampled offering, such as the DX7 set/the CP70/the sampled mellotron files and patches, without integrally replacing the ROLAND and TMP folders on my card (as suggested by the makers inside their README instructies). The replacement would cost me the Rhodes samples and patches.

Can this easily be done? Or does this give rise to an obligatory rmapping/reassignment of the indiviudial samples to a multisample/a patch or so?

Hoefully this can be answered by someone. Thanx in advance!