The 200X series for the J-20 were demonstrators. The J-36 probably doesn’t have an equivalent given how much more advanced the R&D process is now compared to the early 2010s."36011" should be the third J-36 like how "2011" was the third J-20. We might just not see J-36s fly anymore because they are in actual testing area instead of the skies of Chengdu