Why could the Soviet Navy mass more RBU rockets than NATO ASROC weapons?

Were NATO ASROC and Ikara systems equivalent to the Soviet anti-submarine rockets used for aggressive convoy defence?

They served related purposes but were much larger weapons that demanded more ship space and appeared on fewer hulls, while compact RBU launchers and deep rocket stocks could be distributed much more widely.

Compact, numerous suppression weapons offered a different advantage from larger missile systems. ASROC and Ikara could deliver anti-submarine payloads, but each required more space and was fitted to a limited number of ships. A Grisha-class corvette carried two RBU-6000 launchers with 96 rockets in peacetime and potentially more using wartime deck stowage. That scale makes speculative firing and acoustic harassment more practical than it would be with a small magazine of larger missiles or torpedoes.