It has been shown as an alternate Earth to Teen Titans Go! and as Earth 96 in the comics multiverse. That presents 4 possibilities:
1- The Animated Multiverse has a TTG! Earth and DCSHG Earths with the crossovers while the Comic Multiverse has a DCSHG Earth where the crossovers with TTG! didn't happen.
2-Some Earths are special and are in a place in the DC Megaverse where they are part of 2 different multiverses, like in a Venn diagram. That means that either one of the 2 Earths or both of them are part of that special group of Earths.
3-Maybe the animated multiverse has always been part of some comic multiverse.
4-The TTG! are fifth dimensional beings and can travel between all multiverses (I find this theory highly unlikely, but for some reason people are starting to believe in it)