To be careful here - it’s not quite “the same options” as it would find on Mars. It’s an environment that could be derived from some of the raw elements present, but is heavily modified.
The reactors were at a higher pressure than Martian ambient (albeit much lower than Earth pressure), but more importantly their “MDA-1” doesn’t even remotely resemble Mars natural. It is extremely nitrogen rich – ~96% nitrogen/4% CO2 – whereas the Martian atmosphere is almost exactly the reverse of that (95% CO2, 3% nitrogen).
So technically the same components, but in radically different amounts. In order to build that up on Mars you’d have to process fairly large quantities of air through some kind of nitrogen extractor equipment first. Not impossible by any means (we do it all the time on Earth to make gases like Argon) but a bit more effort than just growing it out on the Martian desert, or with slightly pressurized ambient atmosphere.
Still pretty darn interesting though.
