The easiest way to do it I guess is to have a clean install of the 10.14.6(18G103) on a APFS partition just to see what updates system will offer you.I see, I think I'll just stick to 18G9323 and leave it as is for now, since everything else is running fine. @avz
It is an interesting question regardless because when Mojave was a cutting edge people were installing every single update as it became available so it was never an issue.