Not necessarily true:

https://www.livescience.com/24694-identical-twins-not-identi...

paper (PDF) : https://www.researchgate.net/profile/Constantin_Polychronako...

Sort of. A single person's cells don't really all have identical DNA, because of mutations and so on.

So it's one of those things that depends on how close you are looking.

identical twins do not have identical genetic code.