Why naval and land AA guns were not interchangeable

Could the same heavy anti-aircraft gun serve both British land and naval defence?

Only to a limited extent: ships could carry much heavier mountings and used moving guns to disrupt incoming formations, while land forces defended fixed positions with different weight and operating constraints.

Shipboard weapons could accept mountings several times heavier than mobile land systems and often pursued higher rates of fire. They also fired from a moving platform as part of a layered fleet defence intended to break up strikes before medium guns engaged individual aircraft. Army and air-force batteries more often protected fixed sites, producing different mounting, crewing, and engagement requirements. Coastal fortifications could use naval weapons, but those fixed installations were a special case rather than proof of easy service-wide interchangeability.