Presume your talking about the Type31. Don't believe she was a true "copy" of any European design, although it's difficult to say what was 'original' during that timeframe. Personally, I think the Type31 Field Gun kinda looks like a big screw gun; then again, all tubes with wooden wheels start looking alike after awhile...
WRT artillery prior; Japan used two types of 70mm guns. One a Field Gun and one a mountain gun. Both build in the early '80's, and used in the Sino-Japan thru Russo-Japan wars. Interestingly, the 70mm's were made of BRONZE! Seems steel was such a rare commodity/expensive in Japan at the time, they opted to cast bronze.
Cheers
Scott