J-15B or T engine is not yet confirmed. but it is very much possible that they will use WS-10 variant.It seems the J-15B's engines will still be on that vodka time.
these are very minor details. if we talk about this, then even US import a lot parts from EU/Japan. France purchased EMALS and many subsystems from USA/UK. Russia too import chips and electronics.
the main point is, these 4 countries are capable to produce all complex military hardwares.