Short answer, no.
This is why all the manufacturers, engine builders, race teams etc, all have engine dyno's in "controlled rooms" and extensive calibration processes for said engine dyno's etc. There is just way too much variables in roller dyno's in "workshops" to be consistent even day to day on the same dyno, let alone from different dyno to dyno. Even small variations in PSI in the tyres, or how tight the car is strapped down and make measurable differences on roller dynos.
Roller dyno's are most useful for easy of testing "before and after" results for aftermarket performance modifications, since you don't need to remove the engine etc
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