I think, even in the past, China don't buy specific technologies. What they tend to do is to buy whole platforms based on their needs, then reverse engineer the technologies contained and then apply them to other projects.
So therefore it is unlikely for China to buy a whole new Su-35 platform just for the engines, if the engine is the only area they want. And Su-35 will not really fill any specific needs that are not filled by the Shenyang J series.
So therefore it is unlikely for China to buy a whole new Su-35 platform just for the engines, if the engine is the only area they want. And Su-35 will not really fill any specific needs that are not filled by the Shenyang J series.