Very rarely will you find items that will just not work with other brands, but it is highly un-likely. You will most often see this with goggles not fitting correctly with helmets, boots not fitting into specific bindings (even if they should fit, not a size problem). Some items like you listed above (EST bindings) have to be used with a Burton EST board. Other than that just pick what you like.
My jacket and pants are both 686 and those are the only to pieces of matching company gear that I currently own.