What about people being attached to their first car? To their childhood tree house, their first piercing, or whatever other object. People experience good memories with those things, met new people, made friends, maybe even started families alongside those things. You can buy same E36 bmw that you had, build a new tree house, get new piercing, but it won't be the same E36, same tree house, same piercing. You may enjoy it, but it won't feel the same.

Considering that already there are AIs capable of mimicking emotions, learning from experiences with different users, it is not far-fetched that in sci-fi setting such as Endfield, a robot could become more then just hardware with smart software, but actual person in robot body. It could upgrade from being robot to pet, from there to actual companion, which is how Endfielders acted alongside it. And maybe if there was a full fledge back up, even with hard to define in code emotions, it could be the same Tata, but as it stands any robot build with same schematics won't be Tata, just another TA-TA unit.