They should at least look similar. The Markath picture looks nothing like either the Morrowind or Hammerfell Dwemer (which were not identical, but shared many important elements).
Even with the lack of metal, I feel like the structure does bare resemblance to the stone elements of the Dwemer ruins from Morrowind.
http://www.imperial-library.info/sites/default/files/tdgtd_dwemer_ruin_02.jpg
http://static.zenimax.com/bethblog/upload/2011/01/Markarth021.jpg
Its similar, but with more complexity(probably because they can add more complexity to it now) but it still has the rounded domes and tops, lots of buttress-like supports, and of course both are built into the tops/sides of mountains/rocks. It still features towers, although fairly different, they are similar as well. The towers in Morrowind looked like they were made from stone with metal tops. Its not a completely different look.