The frequancy range for the original 450 OEM antenna was 3.3-3.8GHz. This is part number C035045D901A. We've been told repeatedly that ALL Cambium 3GHz gear will be CBRS compliant, I would have to imagine that this antenna would also be part of that.
That being said, most antennas will operate at just outside their frequency range, albeit sometimes with a slight loss in gain. You can even use a non matching radio and antenna together, like a 2.4GHz radio with a 5GHz antenna... but you will experience severe loss in gain.