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They do have external fuel tank, though the internally fitted auxiliary fuel tank is much larger. May be they need extra fuel for doing long endurance flight test.China seems not yet design external fuel tank mount. should be can see in future.
Thanks to @waja2000, my curiosity leads to a feature on Z20 many have see it but pay no attention to it. It is the attachment point on Z20 similar to that of Blackhawks.
By retaining the same feature implicate that attachment of external fuel tanks as well as external stores (missiles, rockets, guns etc) are included during drawing up of blue prints of Z20.