For clarity's sake... CKR and Key ID are two totally different numbers. CKR won't go out of the air and is more for human reference when dealing with a radio that supports multi-key. KID is used by the receiving radio as a logical identifier to scan its list of keys, if more than one, for this KID because it quickly needs some way to distinguish one key from the other. So an agency can continually use the same CKR but as they OTAR this KID will change to something else.
For a current time period you can use the KID to fingerprint an agency along the lines of radio IDs. Being the ASTRO CAI radio ID can still be 1 the ID within the KMF will always be specific. If they OTAR then identification is back to square one.
For single key radios (i.e., M without multi-key) the CKR will be 1 and the KID 1.
