The Russians have not ordered any AESA radar for their fighters yet even though they have production models lined up. Although the Indians have expressed interest. The Chinese AESA technology may be compared to Russian AESA simply because a lot of it is based off it. But that does not mean that they are copies, a lot of Chinese technology is based off a hybrid of "copy", innovate and adapt. So for e.g. the SD-10 may have used the seeker from the R-77 for a start.. today's SD-10 seeker is much more sophisticated and nothing like the seeker from the latest R-77.
However, in terms of fighter AESA performance.. what the PAF has gauged is that Chinese AESA is still struggling with the level of sophistication(in algorithms) found in western systems. Which is why if and when the JF-17 gets a AESA radar... it could very well be from SELEX rather than Chinese. But, considering that an AESA on the JF-17 is at least 5 years away.. it is possible that China would have caught up by then with its rapid advancements.