If it has not been refrigerated, frozen, overheated, or shaken, then yes.
However, each of those processes does degrade it slightly. They especially impact the antibodies that help provide LO immunity. However, even if milk has been through all of those processes, it is still healthier and more nutritious than formula.
And then there are the advantages from breastfeeding that go beyond feeding - the proximity to mom, the switching of positions and sides, the comfort of being snuggled.
The WHO gives a hierarchy of baby milks: 1) Breastmilk from the breast 2)Mom's breastmilk from a bottle 3)Another woman's breastmilk 4) formula.