Remember term differences. To the LDS ‘salvation by grace’ means PHYSICAL salvation, not spiritual. Physical salvation is resurrection and an assignment to one of the 3 kingdoms.
For Christians ‘salvation by Grace’ is Spiritual salvation, i.e. being cleansed by faith and able to stand in the presence of God for eternity (LDS would say this is the Celestial Kingdom). For the LDS, this spiritual salvation is according to works, or as Resty said, what you have in your ‘spiritual bank account’.
Did you notice, no LDS has contradicted me on my above post about this?