Well, I am afraid that these pictures are very confusing and probably PSd to some degree. Are there three different J-10Bs in PLAAF colors? There are three different markings shown here on these aircraft. Is there one "official" PLAAF J-10B or are there three?
The first has no number, the second is "1035" and the third says "1031." Which is it? Is it all three?
The only one I personally think is actually a untouched photo of a J-10B aircraft is probably this one:
They are indeeed different aircraft:
1. Image = psed 1035 with number erased = 5. prototype
2. Image = regular image of 1035 showing WS-10B
3. Image = refurbished 1031 = first prototype with AL-31FN (carries now a plain grey colour with yellow 1031)
4. Image = a very old image of the original firstr prototype 1031 prior to its new two-tone colour and prior to receiving the pitot-less radome (IMO close to its maiden flight years ago ... note the semisonformal pods under wing)
Deino