Is it normal that an OTA update changed it from IN21AA to IN21DA ? Should I care? After I restored the phone, I then restored the backup from my google account. I seem to have all the multi-lingual English/Hebrew features I had before, so I see no reason to worry. I haven't dared yet to take pictures with the 48MP camera, which is the reason I accepted the upgrade in the first place.
That's only normal if you flash a different ROM, it seems you've flashed the Indian one, not the Global one. I'd say there's a good chance something won't work but I couldn't tell you what, it might be something you may never notice (like radio frequency support) or it might be something fundamental. I'd try and get back to a Global build if I were you, that will require another wipe.