What does it mean to have identical birth charts?

It just means that you were born at the same day, same time and in the same place as somebody else.

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Regarding this, can you have an identical birth chart?

Yes. Some people are born at the same time at the same hospital, for example (or in nearby hospitals). There are other people born in slightly different times and places, but the charts are identical because the difference in time and the difference in latitude/timezone "cancel out". Correspondingly, what are the odds of having the same birth chart? No big deal, the odds of that happening are one chance in twelve. However, if you mean that your Ascendant is, for example, 15 degree of a particular sign...and your friend has her (?) Ascendant at the EXACT same degree, the odds of that happening would be one chance is 360.

How do astrologers explain twins?

Some astrologers theorize that even if twins share an identical birth chart, it's likely that they will express different aspects of their charts more strongly than the other. Stardust echoes this, explaining, "At the core, [twins sharing a birth chart] will be the same. Correspondingly, do twins have identical birth charts? Twins are not born at the exact same time, so they won't have identical natal charts. That all depends on the exact time of birth for each twin, and the amount of time between the two births.

Why are twins in destiny different?

The degree of the rising sign changes every four minutes. So the twins that were born with a difference of two to three minutes will have the same birth chart. The divisional chart will differ due to difference in seconds. Another reason for having a different destiny is they are born on a different orbit.