No, many stylus types don't block the the IR as well as a finger tip and don't work on older IR ereaders.
No hard tip stylus should be used as they are for precision resistive (pressure sensitive) screens.
Any stylus that works for a light touch phone/pad (capacitive) will work. There is NOTHING special about the iPad, apart from the 70% margin and overpriced accessories.
Capacitive and IR are low resolution. The only point of a stylus is to avoid finger grease / sweat on the screen. If you have to use ANY pressure at all, it's not a decent capacitive stylus. It adds almost no resolution unless your finger tips are huge.
It's touch, not press. Pressing will break the screen.
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