When someone puts their fingers, or something that they're holding in their hands, inside you, their entire body isn't usually pressed against yours, their hips aren't on yours, their legs aren't between yours, their face might not be breathing on your face, they don't ejaculate bodily fluids into you, and you can't get pregnant and you're probably not going to get an STD. Trauma can have lots of non-physical components like emotional betrayal etc. And only the individual can say how they feel about it. But for me, I don't feel that it's the same.