Most "915MHz" devices are just naming the center of the band, and can operate anywhere within it, or across the whole thing. Nothing operates at a single infinitesimally-narrow frequency except a pure unmodulated sine wave, which carries no information. As soon as you modulate it, you occupy a range. The more modulation, the wider the band.

I have a basement full of Ricochet hardware that operates across the whole band, and it occasionally proves useful for data links that're tricky in other ways. It'd all be junk if this goes through.