If they share a placenta then they are ID, if they are same sex and have two placentas the only way you would need to dna test.

My girls are di/di identical x

Fraternal have two of each their own. As for identical share everything. Dizygotic twins other words are fraternal twins are to seperate eggs nd two seperate sperms monozygotic twins other words identical is one egg and one sperm splits and has everything the exact same from eye color to blood type.