Geographically, Zimbabwe and Zambia share a border that runs through Victoria Falls. Theoretically, every adventure activity (or even any activity in general) that you can do in Zambia you can do in Zimbabwe.
Generally speaking, it tends to be quite a bit cheaper to do the activities on the Zimbabwean side due to their less economically stable currency. However, there is one notable exception: the Devils Pool at Victoria Falls.
You can only reach it from the Zambian side, requiring a day visa at the least if you do not plan to spend more time in the country.