Kaza visa allows you to visit Zimbabwe and Zambia for 30 days with multiple entrees between the two countries. So you can not leave the countries (for example, form Zambia go to Malawi and than enter Zimbabwe with same Kaza visa is not possible) but if you want to visit daily Kasane, Botswana (to visit Chobe NP) you can use the Kazungula border near to Kasane (from Zimbabwe or Zambia side) to go to Botswana for a day and turn back. The Kaza visa accepts this visit.
Kaza visa costs 50 USD but unfortunately we couldn’t get it because it’s not always available at the border in Kazungula border to Zimbabwe. It was available at the Victoria falls border between Zimbabwe and Zambia.
Zambia visa and Kaza visa same price. If you want to go to see the Victoria Falls from both sides Livingstone and than Kariba lake and Manapools in Zimbabwe after that Zambia again it is the cheapest way.