For clarity, the RD0120 and the RD-120 engines are in fact different engines? The RD-0120 were the engines used on Energia.
This topic is the place for data on whether the new Chinese rocket engines are derived from the RD-120 engine. I have seen many allegations, but no actual data.
Other modifications to RD-120 to build RD-870...To reduce the time necessary for the engine to transition from ignition mode to full-thrust mode, a special hydraulic switch will be replaced with an electric valve. Its design will be based on a similar device developed at KB Yuzhnoe for the KRD-120 engine under a commercial agreement with China. Under the name YF-100, that Ukrainian engine successfully propelled a Chinese launch vehicle for the first time in 2015....