You keep using that word. I do not think it means what you think it means.

Newly born identical twin stars show surprising differences

The identical twins were discovered in the Orion Nebula, a well-known stellar nursery, that is 1,500 light years away. The newly formed stars are about 1 million years old. With a full lifespan of about 50 billion years, that makes them equivalent to one-day-old human babies.
[…]
By measuring the difference in the amount that the light dipped during the eclipses, the astronomers were able to determine that one of the stars is two times brighter than the other and calculate that the brighter star has a surface temperature about 300 degrees higher than its twin. An additional analysis of the light spectrum coming from the pair also suggests that one of the stars is about 10 percent larger than the other, but additional observations are needed to confirm it.
“The easiest way to explain these differences is if one star was formed about 500,000 years before its twin,” says Stassun. “That is equivalent to a human birth-order difference of about half of a day.”

So they have different brightness, surface temperature and possibly size. Maybe we shouldn’t be using the baby analogy (it’s not like they share DNA) and should stop calling them identical twins.

Update: Scientific Blogging does a better job, calling them fraternal twins, but the link has an auto-starting video with no means (that I can find) to turn it off!