My CP200 Radio antenna screws on properly on my BPR40 Radio, is this antenna interchangeable?
That antenna was specifically made for a CP200 radio, using that antenna on another radio like the BPR40, will run the risk of burning out the power amplifier. It’s not a question of “if”, but of “when” the power amplifier will burn out. Use only the antenna that was specifically designed for the BPR40.
This also includes many generic and aftermarket antennas which are just not specifically tuned to interact properly with the BPR40 radio. This is a perfectly good example of buyer beware when buying generics.