So I dug around a bit, and it seems like pic #4 was posted once before on chinadefence last December, here's my analysis, xposted from that forum:
Since 99% of the info out there is probably fake fanboy stuff, let's assume this is one as well and I'll surmise the logic used by the creator of this. The prevailing rumors are that the 601 institute's designs are based on the J-10, so both of their designs are made to resemble the J-10. There have been some fairly credible posters stating that a picture that closely resembles the H4B-A3 design is the winner(post #744, which refers to the credible poster on sinodefence), so that was included as one of 601's designs(we've seen quite a few CG photos of it). A purportedly rejected 611 design, a tri-plane design, was shown previously on Chinese TV, and there was also rumor of a 611 design being a tri-plane one(post #702), so that was included as one of 611's designs. The creator had no idea what a second 611 design would be but assumed that there would, so a weird looking Klingon-resembling design was used.
As for the H4X-XX designation, there once was a picture of a rumored SAC design whose file name was SAC 601 H4A-A1(post #650), which seems to be identical to the H4A-A1 listed in the chart, so he probably got that idea from there.
*NOTE* One bit of inconsistency in my theory is that the picture I posted was first posted on this thread last December(post #685), but a fairly trusted poster didn't point out the supposedly winning design until this February.
Of course, everything could all just be corroborating evidence as well. Though pretty unlikely.