I have the same frame set (and love it!) which had several spots about 1 cm in size that needed work. The guy I bought it frame sent it with a touch up kit from this place
https://www.automotivetouchup.com
It included flat gray primer, the Celeste and brush on clear coat and some fine sandpaper. It wasn’t a perfect match and it took several tries before I was happy. I think I might have added a little white to it to match up better. When I look at the site I couldn’t find the color but maybe if you email them.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '82 Colnago Super, '95 Gios Compact Pro, '95 Carrera Zeus, '84 Basso Gap, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘85 Pinarello Record, Ritchey Breakaway Steel, '84 Paletti Super Prestige, Heron Randonneur