According to the depth chart projection 11W's Eric Seger released as recently as this Monday, Donovan Munger and Tracy Sprinkle are in an "OR" kind of situation as to who will start and who will be the back-up at one tackle (probably a rotation). And he has Michael Hill slated to start at the other tackle - with Nick Bosa listed as his back-up, interestingly enough.
Eric doesn't designate on this chart which position is which. However, he has Munger and Sprinkle at the position listed next to the WDE, Tyquan Lewis, which of course, in a '4-3 over' (which I believe we'll still be running in 2016) would be the "1 technique tackle". Naturally, that would mean that Hill and Bosa would be at the "3 technique" spot just inside of the SDE, Sam Hubbard.
I find that to be a little strange, though - since Hill is our only remaining proven player in that "1 techique" role. As we've seen in the past, not just any DT is capable of playing both positions well. I'm afraid Adolphus Washington spoiled us to a degree.
Now, it could be that we're going back to the '4-3 under' (like we ran a few years ago - and in which, the tackle positions are flip-flopped from the 'over') - but this would be the first I've heard of it. Plus, at 265lbs (and as a true freshman coming off major knee surgery) I seriously doubt we'd be playing Nick Bosa at a position typically reserved for 300lb-ish juniors and seniors who have to be big and strong enough to demand a double-team for the scheme to work properly.
I believe Eric has good connections with the team - so his chart has a lot of credibility as far as I'm concerned. It's going to be very interesting to see how this develops.
Incidentally, to answer one of your more fundamental questions: The "1 technique" defensive tackle has traditionally been considered to be similar to a true "nose tackle" or "nose guard"(which is more often associated with "odd front" defenses - like the 3-4 or the 5-2) - but the positions are not identical. You can tell this by the designation.
Of course, it gets more complicated than this - but the "1" in "1 technique" generally refers to the inside shoulder of the offensive guard. Naturally, the "nose" generally refers to the foremost point of the o-line - the center. However, many coaches refer to the two positions interchangeably since there's not a lot of difference in physical requirements.
For instance, ideally - we'd like our 1 technique tackle to be so disruptive (right in the middle of everything) that he'll demand a double team. That then frees up our quicker 3 technique tackle and defensive ends to defeat their one-on-one match-ups - and really wreak havoc.
It should be noted, though - that Coach Johnson sees the differences in the roles of the two tackle positions becoming more blurred down the road -