RD-120 vs YF-100， YF-130

the Chinese have spent past 13 years( 1999 to 2014) replicating the RD-120 for the CZ-5 rocket family.

They use a LOx rich mix in the turbopump, which gives them their great performances, and that tend to set the metal parts on fire,.

The RD-120 is closed cycle/staged as well, and should gained plenty of experience with LOx rich cycles

YF-100 is derived from a modified Ukrainian RD-120 with elements from RD-120K engine version and is designated in Ukraine as KRD-120. KRD-120 is also the basis for developing the RD-870 for Tsyklon-4M and RD-872 is the second stage equivalent of the RD-120. The Commercial Agreement for YF-100 is filed in Ukraine and a redacted copy may be obtainable.

....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.

RD-870

wikipedia

analysis of chinese cryogenic rocket engines

spaceflightfans cn

YF-130 500 ton class, for LM-9 (CZ-9), globaltimes

Nasaspaceflight

b14643

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