Range yes, performance - not necessarily.
The P100D provides greater performance than the 90D in part due to a higher cell count.
Simplistically if Tesla are drawing the max (safe) current from the cell then the only way for more power is more cells.
The 2170 cells are a different size (duh) therefore the current pack size may not accommodate the new cell geometry at the most efficient packing density. Therefore this may mean that the MS will need a more significant update to the body shell to fit a new 2170 based battery in. There could be hope that the MX already has the capability built into the design to take either battery as it is more recent, but the MS I doubt due to the age of the design.
What we dont know of course if whether Tesla have managed to reduce the cell IR in the 2170s which would permit more current per cell and in turn reduce the cell count required for a given battery power output (possible improved power/weight too). we can hope.