IMO, I don't think these tags are synonyms to each other. As per my understanding:
- Moksha: The person will be out from the cycle of Life and death and will reside in the abode of God with eternal peace.
- Mukti: Being freed from one life form. For example, there are many Devtas who were cursed to become a monster and being freed (mukti) if someone (mostly Incarnation of gods) kills them i.e the monster.