These are mine so far (updated until today!)
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looks like WS-10 engine..
Quite impressive that they have been able to switch al-31 and WS-10 in the same hole back and forth. Nice engineering of harware and software.Good observation and indeed the no. 01 prototype aka no. 571 was fitted with WS-10 engines! As far as I remember correctly another one however used again the AL-31F engines.
As it seems, - via @FaySue6 on Twitter - is correct ... this J-15 spotted at Dachang is NOT a J-15T:
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