The vacuum (6.2 or 6.5) pump should provide between 22" and 26" Hg. The 6.5TD electronically modulates the vacuum to the actuator at 15" Hg. Some simple math should show how effective the Chinese wastegate actuator may be at specific vacuum rates. Measure the areas of the wastegates and actuators of both, and compare. Also compare the moment of the wastegate lever. If all are the same or similar, you should expect similar performance.

You should not use the tranny modulator vacuum valve for wastegate control. It has no relation to the actual level of boost or load. You will need either an electronic or mechanical vacuum control solution, if the vacuum actuator is used. Also consider the operation of the Chinese actuator. Is it NO (Normally Open), or NC, and is the vacuum actuating closure, such as the 6.5, or actuating opening, as in other brands, or is it reversible? If it is a GM-x clone/copy, vacuum should hold the WG closed, while removing vacuum should allow the WG to open with exhaust pressure.

If you want to use mechanical WG control (Turbo Master), and the controller you have doesn't fit, either adapt it, or fabricate one. It isn't complicated. If the engine is EFI, the electronic WG control is built-in. If you use a mechanical solution, the PCM may have issues with mechanical control if it isn't programmed out. The PCM monitors the WG vacuum modulator (passive), and will miss it if it's not there or if vacuum isn't correct. Of course, if the fuel system is MFI, it is up to you to adjust the system for target boost and EGT levels. Boost and EGT instrumentation is essential once you get away from OEM trim.