I've found quite a few RTs that crossover just fine. Swings crossover to Even feel, and 4s to 3s. For example, Pop Acoustic Swing Bass plays very nicely in a Bossa (even) style.

Best bet is to just try some combinations despite any feel differences. You may be surprised.

The underlying style is what determines beats per measure. There are some Blank styles that you can use as a template. Just start with the Blank style, add chords and pick your instruments.

R