Seems like a bad idea in any case. I always see some speculative post like "Can I install upgrade for new model XYZ and get all its benefits on old model ABC?"

Even if the two products are relatives in the same product family, you never really know what changes the manufacturer has made in the hardware. The changes may have nothing to do with tone generation (e.g., a handler for a different LCD controller) that may brick the keyboard.

Just say "No."

-- pj