According to Osho, in the ultimate/transcendental sense they point to the same freedom; but practically ‘salvation’ implies liberation by another (a savior), whereas authentic moksha, nirvana, or Vaikuntha mean self-realized freedom through one’s own awakening. Dependence on an external redeemer keeps you entangled; real liberation arises from personal responsibility, awareness, and inner transformation—not borrowed virtue or secondhand grace.
Ultimately they all mean being truly free, but ‘salvation’ says someone else saves you, while moksha/nirvana/Vaikuntha say you wake up and free yourself.