They’re completely different.
The right to a job, which is described in international circles as a “right to work” (hence why I prefer using the term right to a job, because it leads to less although not no confusion in U.S circles), is the idea that an individual has a right to earn a living and that if they can’t find work in the private sector, government has an oblgiation to provide a job for them.
In other words, it’s a way of describing a job guarantee but emphasizing the right of the individual as opposed to the oblgiations of government. In the U.S context, it flows out of FDR’s Second Bill of Rights:
“In our day these economic truths have become accepted as self-evident. We have accepted, so to speak, a second Bill of Rights under which a new basis of security and prosperity can be established for all—regardless of station, race, or creed.
Among these are:
The right to a useful and remunerative job…”
So the right to a job comes from a left-wing, pro-labor background, whereas the “right to work” (for less) comes from a right-wing, anti-labor background.