Does the saddle height need to be changed when the crank length changes? On my road bike I have 172.5mm crank and my saddle height is 810mm from the bottom bracket. On my track bike I have a crank arm 165mm. Do I need to change the saddle height on my track bike? Will it make any good difference on my pedalling efficiency?
Saddle height for new bike setup purposes should always be set relative to the pedal, not the BB center or any other reference point. So yes, crank length makes a difference.

Using the ground or BB center as a reference point is convenient for re-establishing a given height after the post has been moved, but not for setting up one bike to have the same leg extension as another.