“In theory”, the numbers should be able to be compared to each other…….between dyno to dyno, or flow bench to flow bench.
The reality is…….they can’t be(or…..shouldn’t be).
Sometimes they’re close……..and sometimes they’re waaaay off.
I’ve owned a flow bench since 1992……..and I see both situations quite often.
I’ve been dyno testing since 1990……..same scenario.