It'd depend on how much bigger the TFX/MMU is compared to the J-35. It sounds like the J-35 might be a pretty big fighter in its own right and, possibly, have nearly as much range and payload as the TFX Block-1. Remember, the J-35 is an evolution of the FC-31. So, China's been working on this design for nearly a decade and, as a result, the J-35 carries forward lots of key improvements.
The TFX/MMU, on the other hand, will come in hot. The first variant might be on the lighter side and more optimized for the air-to-air role. But a later version will probably be heavier and offer a bigger emphasis on deep-strike, for example.