I recently noticed that LEGO included guidance on this exact issue in their instructions in the late 80s and early 90s. Here's an example from the 1989 Universal Building Set (8034):
Here's the bit referring to disassembling these sorts of elements:
I usually use Rebrickable to compare whatever I need.
First, you need to create two custom lists (My LEGO > My Custom Lists). Import tool supports "BrickLink Stud.IO files" so no conversion is required.
Once you got your lists sorted you need to compare them using "Compare sets" feature (Sets > Compare Sets). While the name suggest ...