I highly doubt the logistics ship could have a 76mm. Remember that the role of the logistics ship is to resupply the frigates and coastal corvettes, hopefully well outside the danger zone, so it would at most have a gun-based CIWS (40MM or thereabouts), 12.7mm machine guns, and probably a Mistral Simbad launcher, going by what the ship they're gonna replace (HNoMS VALKYRIEN (A535)) is armed with (2x 12.7MM, 1x Mistral Simbad).
The name of the real ship is tentatively KNM FRAM, she'll be based on the BERLIN-class, weigh 15,000 tons, with vital dimensions 155 meter long and 22 meter beam, and carry up to 5000 tons of fuel for the frigates and other vessels.
Official art of what the real ship's gonna look like.