I believe early access is a different software distribution train, with its own set of updates and schedules. It may be that when you transfer the car ownership, you'll go back to the standard release schedule. You may want to ask about this.
This point deserves emphasis and elaboration. I'm by no means an expert on Tesla's early access program, but as I understand it, the early access release numbers are
not comparable to the standard release version numbers. In other words, that early-access 2019.7.61 number shown in the screen shot might mean that the car has more
or fewer features than the 2019.12.1.2 that most Model 3 owners now have.
When Tesla figures out that the car has been sold, I'd expect it to be removed from the early access program. At that point, or at the next software update, the car will likely download a non-early-access software release. If the current software includes pre-release features, like Advanced Summon or the ability to use Autopilot-type driving on city streets, then you'll lose those features. (Unless of course they've been released to the general public by then.) If the installed software is behind on features that are new to 2019.12.x, then you'll gain those features. You'd probably have to dig through the car's menus to figure out what you'd be likely to gain or lose -- and that would only tell you about menu-accessible features, not things like whether the car is subject to "phantom braking."
In the long term, this isn't likely to make much difference. New features go out to employees and other early access cars for alpha testing, but sooner or later they should make their way to the general public. I don't know the time frame for this, though. I'm sure it depends to some extent on how buggy new features are. I doubt if it'll make any difference in, say, six months, unless perhaps a bureaucratic mistake leaves you on the early access list for an extended period of time. You might or might not want that, of course.