I think it might be, there’s no way Anakin would be able to buy proprietary hardware or software. So either he stole it, which his mother probably would not have allowed. Or he was able to scrap all the parts together because there is a template for humanoid protocol droids that we have also seen round Star Wars. And then the software itself either Anakin programed entirely himself, (which I know he’s very smart, but even that seems a stretch) or he forked it. So it would make more sense that there was an open source catalog of protocol droid software. It also would make more sense due to the fact that a lot of people have droids, but they are not all created equal. I would think many of the droids on Coruscant were proprietary, while many of the droids in the outer rim are open source.
Since the universe of Star Wars is a similiar Corporatopia as in Rimworld, maybe there’s SOC-like Personality Cores, that just adapt to the available actuators and sensors (there was a self-learning 4-legged robo-spider 10 years ago already, that teaches itself walking no matter what).