I've never had either, but from the structure I would venture to suggest that it would be 4-AcO-DMT. Since psilocin is 4-hydroxy-DMT and the ester group on the 4-position may well likely simply cleave off in vivo very easily. Esters are quite labile. Although it is not a foregone conclusion. Whereas with dimethyl vs methylethyl substitution on the amino nitrogen, is chemically much more similar, and there are dramatic differences between for example 5-MeO-DMT and 5-MeO-DET, DMT/DET pairs, the amine nitrogen is much more important with the regard for the nature of the substituents in tryptamine psychedelics than it is in psychedelic amphetamines.