You might be onto something there. My brother and I shared the same womb. I weighed one pound more at birth and through life I've always been 10+ pounds heavier.
Another thing, while in the womb, we decided to be just adorable... some things never change. :)
Bump for later reading as a father of identical twins.
They are almost to the age where they are done losing their baby teeth. They lose (and grow) in a mirror image of each other - every single tooth! (Upper right for one, upper left on the other, etc.)
But yes - different in so many ways. The oldest was a natural birth. The second was an emergency “c-section” with the cord wrapped around her neck. Born 10 weeks premature. Neither had any real complications though. Interesting that the second one (with no air/heart beat) is now about 1/2 inch taller and a couple of pounds heavier. Although at birth I think she was a half - ounce bigger than her sister (IIRC: 3 lbs 4 oz and 3 lbs 4.5 oz).