From my reading of the literature on twins its reasonably unlikely that they share the yolk but ether way wait till they exit the egg. That said though it is possible. Bearing in mind I am no expert in reptile breeding just based on my curiosity and a drunken pondering that led to me to spend time reading about it. Leaving drunk notes to look stuff up while sober has some interesting results - including knowing more than I expected about twins and the diet of different countries badger population.
Edit: and yes I am drunk as I write this, my excuse is bad/stressful job and family issues.
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