Hi bubnyk, in theory yes as long as the relief allows for it.
1mm should be ok but if you want to remove the saddle first and check to see if the rosewood shim is still fitted you could remove that first to lower the saddle.
A scalpel blade or pin can be used to "grab" the shim if it's wedged in.
If you do need to sand the saddle then best to take it slow, carefully and use a flat surface with the sand-paper.
You ant to make sure you keep the bottom of the saddle flat / level.