Thanks for the links. I'll check them out. BDs form like stars, with gravitational collapse of gas and dust forming the object.
Planets form by accretion, with some small body accumulating mass through collision.
So the difference is theoretical. In general, a planet is too small to have ever fused hydrogen in any form. For more info about this, try looking at my webpage about brown dwarfs . No matter what, it's either too small, or formed through accretion. Thanks for the links.