The 2012 has those articulated nozzles like the J-10B TVC variant. But the 'ring' between the petals and the engine body is the same.I must admit, based on the latest image showing J-20A no. 2052 with its WS-15 nozzles much clearer than before I'm questioning, if the previously seen image showing J-20 prototype no. 2012 with two different engines was indeed an alleged WS-15 prototype or a WS-10B3 TVC nozzle? The differences are simply too many and the details are too different.
View attachment 118263
Could it be a WS-15 with TVC being tested but not adopted (yet)?