Isn't the 10kA or 22kA (both of which sound like a sod of a lot) the maximum value the breaker is able to interrupt? i.e. if your circuit suddenly fails and draws 15kA, the 10kA breaker will try to trip but fail to do so. If that is the case then the 22kA would be strictly safer than the 10kA, so replacing the 10kA with the 22kA would seem unlikely to affect compliance.

Peter