Case lengths of Chinese 60mm

Here 2 Chinese 60mm rounds. One for use against divers and one for fire extinguishing.
The anti-diver round seems to be an upscaled 40x46SR and assumingly should have a high-low pressure system.

Is these 2 rounds the same caliber as for the case, ballistics and bore design?
Does anybody happen to know the case length(s)?
Is more info available?
What are the guns for these rounds?

Source: internet
60mm_anti%20diver_China zzz