N-D B's page

Can you release one project under the Pathfinder compatibility license and the 5e license? I know you can release similar products, one under the PF license and one under the 5e license, i.e. the current Midgard kickstarter, but what about one product made for both systems? Thanks to everyone who answers.

I'm not sure if this is the right place to post this. But I was wondering, is there a specific format typically used for third party publications? I am wondering because I am thinking of eventually publishing something small and am wondering how that should be formatted/what I should use to do that, or even if I should do that.