You get an increase in maximum black. If you tone for longer durations all densities increase. After toning in sulphur, it generates a reddish tone. Lith prints tone in a cooler magenta to blue.
The content of gold in MT9 and MT10 is the same.
MT10 affects all densities uniformly. MT9 tones faster in the highlights, but needs more time than MT10 to fully tone the shadows