No, the overlap is not strong in that area.
Nambour RA 1 commercial site is east of Gympie and towards the south of the licence area at Bald Knob east of Maleny. Signal unstable west of Black Mtn on the M1.
Maryborough RA1 commercial site is at Scrub Hill, the low ridge you drive over heading into Hervey Bay. Signal is limited to the south. Insufficient to reach the southern boundaries of the licence area.
Maryborough as with Bundaberg should be at the main TV site, Mt Goonaneman in a similar setup to Moree and Gunnedah FM services at Mt Dowe. Unfortunately, the licence owners when licence boundaries were defined were not future thinking in ensuring a wide area was drawn. That legacy sees quite a lot of the surrounding area deprived of a local commercial station.