I think its possible that when Sartre is discussing freedom, he is referring to object level freedom as it is (the degree to which it is possible, in fact, which is unknown), whereas Camus is coming at it from a more abstract, analytical perspective, acknowledging that while we have some freedom, it is not completely unconstrained (which Sartre may simply take for granted, without acknowledging it explicitly).

Someone smarter than me would have to weigh in on the plausibility of this based on their comprehensive writings though.

> We are born into a world of choices such that we have sole control over what we choose.

I think this could be considered similarly: what does the word being used to point to the underlying phenomenon (freedom/choice) actually mean?