Your tabs should be your top level navigation; and should be as general as you can make them (So you can organize your content in finer layers like in Cards, Lists, etc). In your situation; using cards as your next layer of refinement in content organization; I would personally say keep it consistent with the other tabs - and have the heading on all the cards; regardless of the content on that page.
I also want to iterate that not every tab has to have content within a card; some elements of information are better displayed as a List, or Grids. Make sure that the content your populating on the tabs suits the usage of cards:
A card is a sheet of material that serves as an entry point to more
Hope this helps!