I copied and pasted a page or two from the military pages of this forum years back but can't put my hands on them ATM. Try the "ground targets" pages. There is a lot of tanky stuff but the colours will be the same and very well covered. From the top of my head, SCC. 1 (Special Camouflage Colour) was a little darker than RAF Dark Earth aircraft paint, just needs a dab or two of chocolate.
As someone once wrote, refering to the buildings at RAF Worksop but still a valid guide to camouflage paints in general: " The RAF only had three colours, S***t, Dark S***t and Light S***t.