Hanno,
The same way that 25-pdrs from Malaya ended up scattered across the islands of the SWP: the Japanese moved the captured equipment about to where it was needed by Japanese forces. There is a 25-pdr in the collection of the AWM that is ex-British Army, ex-Japanese Army, 'resumed' in 1945.
I suspect a specialist truck like a water tank would be the sort of equipment that would be moved and used in other places.
Mike
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