YNWOAN
100% Analogue
The two points I am thinking of are; 1/ how the effective mass of the arm is altered and, 2/ the change to the moment of inertia as the arm tracks records that not entirely flat, which is pretty much every record. I suspect the biggest influence on the sound with the heavier Naim weight is actually down to the alteration of the overall effective mass but this is just supposition on my part. The SKale is a slightly different issue though as this uses additional decoupling between the counterweight and the counterweight support stub and this will have its own impact (you can also adjust the weight by adding/removing additional shims).