Hi Steve,
Yes - The N.28's upper surfaces were the factory standard pattern of Chestnut Brown, Dark and Light Green and Beige. The right upper wing 'foot print' and right upper horizontal stabilizer patch were lamp black.
When passed to the American units, they embellished them with various colour schemes on the engine cowl, wings and on a few, with posters of the time pasted onto the right upper wing surfaces (see the 27th, 94th, 95th, 147th Squadrons).