In practice, it's often only the same behavior at an abstract level because the drives and sensations involved aren't the same. For example, many gay men have gotten married to women, had sex with them, and raised children with them. Deaf people sometimes seem to hear things because they've trained themselves to look for associated cues that non-deaf people aren't aware of. Colorblind people sometimes go years without anyone realizing that they're colorblind because they learn what colors common objects are expected to be (e.g. the "go" light on many traffic signals will look gray/white to someone with deuteranomaly, but it might not even occur to them to call it something other than "green light").

In more recent years, for various reasons, I stopped 'practicing' and it's been kind of shocking how quickly I've reverted to the original 'baseline' hermit-like life.

While of course I hesitate to draw firm conclusions about my 'nature', it does seem as if a good 10-15 years of effort have not made being more extraverted any more natural, just easier and tolerable.

Contrast that with my extravert friends who can barely manage to spend one day alone, and have been this for most of their lives. I'm sure they could learn to tolerate solitude, but I wouldn't be surprised if they have a similar tendency to 'revert' to their extravert selves if they don't put in continuous effort.

While it certainly is possible to form new habits, but as long as they go against your nature the price to pay for this is high: you could cultivate a neurosis or depression by doing so.