Ahh.... It seems they are different, but do the exact same thing. Unfortunately, in my case, they pulled the skin tighter than they should have, and the skin was overlapping when it healed.

Yes, exact same but different. Folks sometimes torque the crap out of steri-strip -- over-overlap -- on the assumption that they will stretch, but that's not how they work (usually).

At least, that's what I assume happened, I was after all 7 years old when it happened. 21 years later, the scar is barely noticeable,

Yeah, 40-some years later, nobody notices the scar where that sewing machine fell on my head. It just blends in.

... Now I'm just too used to my hair being this way to change.

Enjoy your hair!