Sorry if this is a silly question but are the LP and the LNP the same party? When I try to look up LNP I see references to Queensland which confuses me if it's a national party. If not are they related?

Yeah, it's confusing. The federal parties are made up of state branches, and the state branches of the Nationals and Liberals merged in Queensland.

Federally the two parties are in coalition, so it's basically the same anyway, even though they are technically different parties in the other states.