Yup, that seems like the same hitchProprietary hitch for proprietary tillers that Kubota uses on rice farming countries like Vietnam, Taiwan, and so on. Proprietary hitches used to be quite common on those older grey market tractors. This quick hitch in particular, would most like work with another proprietary attachments.
Can be barely seen here (white thingy):
View attachment 615833View attachment 615835
I will see if I can work with both(so far 2 pieces) of implements. Tiller, similar as on photo and carry all box I finish building as of right now