Yes they do refer to Humbrol numbers. Some kits even refer to Vallejo colors.
BUT, if you are intending on doing her as the USS Hiddensee, in US Navy test & evaluation service, the hull & superstructure color for USN Modern Haze Gray would be 26270. Modelmaster Neutral Gray is 36270, flat vs satin. For the deck go with Gunship Gray White Ensign Colourcoats also have an excellent series of paint for US Navy modern colors