pathfinder 1e – Does the cleric’s ability to spontaneously cast cure spells apply to the Breath of Life spell?


Unfortunately, the “spontaneous casting” class feature for clerics (which is the one that allows this trade) clearly states.

 A cure spell is any spell with “cure” in its name

So no, a “breath of life” is not allowed by the rules as written.
Obviously, nothing is stopping your GM from allowing it anyway, but the rules are against you