Not all SM oils are on a level playing field, and not all gasolines are either.
Chemically, two identical molecules will act exactly the same way. But in a complex system, filled with all sorts of chemistry - regardless of whether it is oil or gasoline, this is far from the case, especially due to the differing chemistries of the additive packs.
"good enough" or "close enough" is the case, for SM oils, and for most any gasoline. Many (most) dont use top tier gas regularly, nor any additives, and still are fine.
Top notch oil and top tier gasoline buy you added protection - to some extent. Top notch oils from superior basestock and add pack, top tier gas having the same commodity hydrocarbons as any other gas (the gasoline is always bought from the closest refinery) is only differentiated by better additives.
Please search on the topic, there is a LOT of good information, especially by fuel tanker man.
JMH