Tower brand radio gear is, in fact, Futaba gear in disguise. (at least the tower gear I have and have seen, I haven't checked the whole line). So, yes, your Tower RX will work with a Futaba TX, assuming both are FM. PCM is a different story.

In general, Futaba and default Hitech and Tower all work together. (RX and TX)

JR and Airtronics work together (RX and TX), but not with the above set.

Hitech, FMA, GWS, and many others make RXs that come in two models, one for either type of TX. Some companies make switchable RXs that can work with either.

Hitech and Polk make a switchable TX that can work with any RX (again, assuming all FM here).