The long and short of it is it's MX 19.2 with a few less packages imo.
The install went without a hitch and works good although I still find MX 19.2 Base to have way to much default software that I will never need or ever use.
I wish MX Linux would have offered as a core and then I could install only the needed software I wanted and nothing else.
TBH I don't find any advantage of the MX Base version over the MX Standard version five and a half one way and six another.