Well we wouldn't need picture confirmation now would we since we have the Global Times article? Any how, why don't you answer the question I posed in my previous response (which happens to use your very same logic)? I have answered your question and now it is time for you to answer mine.And applying your logic, where in the Globaltimes article that you linked can I find the photographs by which you have "definitively identified the Z-20's engines by outward appearance"?
Anyway, let's try this again. Read the following paragraph carefully, then answer the question after the paragraph:
Question: what engine does J-20A use?
Question : In the final design of the J-20, it is supposed to be powered by the WS-15. Does it mean that current J-20s should be powered by the WS-15 because they are production types? How do we know definitively that the Z-20 in its current form is its final design?