Yes, the Catastro department from La Huerta comes each year to collect what they call predial, property tax I believe. And yes, depending on which office has jurisdiction over their property, some people pay La Huerta and some pay the local Ejido office (I don't know what the Ejido calls this yearly payment). For instance, my home changed to titled so I no longer pay the Ejido and I go directly to the Catastro office. So you pay only one entity, not both.
So the moral of the story is to check with the Ejido office or Catasto to see where your payment belongs.
On Saturday, you will be able to make other kinds of payments also like for business licenses. However, no yearly car registration payment services will be available here. For those kinds of payments, you can go to Cihuatlan for the closest office. Vehicle transactions are State, and not County or Ejido, affairs.
I hope this helps. It is very handy to pay here if your 'tax' belongs to Catastro or La Huerta. Cruz