E doesn’t have any effects on your voice to be undone. What T does is it thickens your vocal cords which makes your voice sound deeper. But there’s a lot of differences between men and women’s voices that aren’t related to pitch and instead have to do with intonation, pronunciation, resonance, etc… Some of these can be helped by the vocal thickening, but others don’t change at all. Like, just as an example, some of the differences between voices are literally caused by how big a person’s mouth is and T isn’t going to make your mouth bigger. This isn’t even considering cases where a transmasc’s voice doesn’t get much deeper or they want it to go deeper anyways, which do happen just like how transfems sometimes don’t get much breast growth or their breasts aren’t as large as they want.