Nope. There's actually a simpler way to do it. Since most of the two systems are the same, you can single-ROM-mod the main board (or mod the Braze kit's single ROM, which is how I did it), and use double-sized ROMs for the single ROM and vector ROMs, controllable via a switch. This allows you to reconfigure the main board with the flip of a switch. Then swap aux boards and the CP, and you're all set.
This way you only need one power system and modded main board, as it's really just the aux board and CP that are different between the two games.