Vulcan Centaur uses a BE4 from Blue Origin for the vulcan and the Centaur upper stage uses the Aerojet Rocketdyne.
The Vulcan booster has a 5.4 m (18 ft) outer diameter to support the Blue Origin BE-4 engines' liquid methane fuel.[20] In September 2018, after a competition with the Aerojet Rocketdyne AR1, the BE-4 was selected to power Vulcan's first stage.
Starliner did complete the first half of the mission, not without quite a few hiccups. But they did sort them out eventually.
There are some comparisons though. The SpaceX dragon made every move as predicted and hard docked, after soft dock, in 11 minutes. The Starliner had thruster failures, the soft dock assembly failed to correctly align and had to be closed and opened a second time and the hard lock took around half an hour.
There were other issues which also forced the miss on the first docking window and I heard some discussion of timer resets and stopwatch in the background as the commentry was ongoing.
The Starliner controls are right out of the shuttle program and the control of it seems to require extensive manual checking and intervention. It will work but it won't be easy. Coming back down will be another learning experience. On reading up on the first two Crew Dragon missions, the second mission return, with the human crew, had excessive wear on the heatshield after reentry. So there is always something to learn.
The nice part was the ISS with two different commercial crew modules attached at the same time. Progress, albeit quite late.
