I have id dtds and they are on their 3rd pair of shoes and 2 times out of 3 they've had the same size, one time the difference was one width but length the same. Lady in Clarks said she couldn't believe it as she'd seen loads of twins and they are always different... but they are id, similar weight (couple of ounces different) so it makes sense they'd have the same size feet.
Were your dts the same? Just curious