Thanks for the input, @Gio and @John_E , but it is not that I doubt (at all) that different types of strings have different tensions.
What was baffling me was how the exact same strings (apart from perhaps age and wear and tear) were giving me different “tautness” feels on different basses, and even basses with similar scale lengths.
TI do too, but they are probably still more expensive than Stringjoys 
I go back to QC and manufacturing tolerances.
TIs are far more expensive than Stringjoys. At least twice as much
Stringjoy’s are priced similar to NYXLs
Yeah, Elixir too.
It finally happened. I broke a string while changing strings and don’t have a replacement set on hand. FML.
I might have… overordered backups in response 
Luckily not a bass string or that would have been even more expensive. (not to mention difficult)
Ha! Not laughing at you, but my spare gee-tar strings came in today. They seem so fragile to me lol.
Just wait for what they do to your fingers
Gotta admit, until I read further in your post, I was like “WTF? That’s a thing?”
I have broken a nut changing bass strings though
I hope on the bass…
fortunately yes