I think I pulled a prank with my twin daughters when they were born and even to this day I don't know if their names are arranged correctly.
Do you remember anything about your twin daughters?
I remember one's name as E and the other as G.
Each of your daughter has her own identity and playing a prank on them by mixing them up is harmful. They might grow up confused if you can't tell them apart.
I don't see what I did as abuse. How about you get professional help?
You should give them bracelets or something to try and remember which child is which. If you have to take them to the doctor it would be really harmful to forget who is who.