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First, genetics are only a blueprint for the structure of the body. It's not the final structuee. It's like asking why a building collapses when the blueprints look sound. The blueprints might have physically impossible information for the location it's being built on, or something could have interfered with the building process, or there might not be good quality materials to do the construction properly, etc. Identical twins often are not identical right out of the womb.
But let's assume you could accurately create the exact structure out of the womb. The initial physical body might have some effect on your ability to develop intelligence or not (e.g. blood flow to the brain, etc.), ability to generate and use certain hormones that affect mood, etc. This might make the two copies have the same disorders like ADHD, propensity towards violence, or other things, but is every person with ADHD exactly the same? So, no even that isnt enough to create the same personality.
Then there are environmental factors, nutrition, radiation, pollution, etc., all of which could alter the brain in different ways over the person's lifetime.
But personality has a lot to do with the neural connections and memories you create throughout your lifetime than just the brain you were born with and the physical environment you grew up in. Just look at twins raised in the same home. They can have significantly different personalities based on different experiences, different memories that were impactful, etc.
And personalities change over time because of all of this. So someone at age 30 and the same person at age 50 is often going to have somewhat different personalities based on all of this.
What might be possible, though it would take technology we may never have, would be to individually copy every single atom in a person's brain with something like a star trek style replicator, and implant that in a cloned body that was as close as possible to their body at the age you copied the brain. This would include every single neuron and neural pathway, every single drop of hormones, etc. And somehow do this instantly or at absolute zero temperatures and then instantly bring them to normal temperature to prevent any damage to the cells. Of course that would be absurdly difficult and is only science fiction, of likely to ever be reality. Too many variables, too many ridiculous technological dependencies, etc.