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To be able to pick exactly the screw you need for a particular purpose, it helps to know what each part of the screw does.
The mirror screws with caps are the spiral that actually pulls the screw into the wood and holds it there. Most have the same profile, but chipboard screws combat the material's crumbly quality with their shallower spiral; some screws have a double thread, which means the screw won't wander off-center and can be driven more quickly.
Most mirror screws with caps have about two-fifths of their length unthreaded, forming the shank, but chipboard screws are threaded all the way up to head for better grip.