You may need a visa for Zambia if you have a Comorian passport
Visa options for Zambia (2)
Electronic visitor visa (KAZA) for Tourism between Zambia and Zimbabwe
The KAZA eVisa is for travelers visiting Zambia and Zimbabwe for tourism during one trip. Travelers can travel freely between these two countries, entering and exiting each country multiple times. Travelers can apply for this eVisa online before travel. Travelers must start their trip in Zambia if they apply through the Zambian government. Check the source for more details.
This is not offered by sherpa°.
Apply on the government site.
You don't need a visa. You can travel to your destination for a limited stay. Be sure to check other entry requirements and how long you can stay for.