Astrological twins.
A redundant question regarding how astrology works is about the reason why two people born in the same place with the same conditions in their horoscope, and therefore with the same natal horoscope, can have different lives.
Far from being a detriment to astrology, this question helps us understand it better.
First, it is unnecessary to recall the difficulty of two babies born from the same mother and in absolutely simultaneous fashion beginning to breathe; I don't say it's impossible but it's not the norm. That said, let us clarify that each individual's destiny for astrology is a blend of the conditions in which they were born and how they have integrated their vital experience.
If two children born with the same natal chart board a bus, if the door is not wide enough one will enter first and the other after; if two people born at the same instant are breastfed, one will be first and the other after, from the experiences that differentiate all those events even though they seem small details, and especially from how they are integrated in each person emerge different responses, and those different responses translate into a different destiny.
Astrology determines similar influences and cycles for both, however the way of assimilating lived experiences is not under the influence of any celestial body. There is the possibility that they can integrate jointly and this is the case of astrological twins, but due to the impossibility of occupying the same place in space and time for both, it will create a different destiny for them.
Let's take meteorology as an example: if a tsunami like the one that occurred in Japan were to happen again with the same magnitude and in the same place, the effects on the population would be different, and they would even be different if the buildings were absolutely similar to the previous ones. The experience of what was lived conditions the future.
Following this example, it is easy to suppose that in no case would a building of the same type with the same safety problems be built again.

Astrological twins exist; there are documentaries that explain the similarities and connection between people born under these conditions. They are usually dressed the same way, they tend to have a stronger connection with their twin. Why couldn't it be any other way? Why not think that they could relate better to other siblings or have more emotional or psychic connection with other people? The answer is closer to psychology than to genetic factors.
The position of the stars in a natal horoscope does not determine how each individual integrates the experiences they live in each moment. You could say, using another example, that it determines the operating system with which those experiences will be integrated, and we could even talk about the hardware, but from my experience I must say that we can reprogram, that it is possible to direct things with a certain freedom. Astrology is that person's genuine operating system.