Hi John,
Attached is the old Colour Coats Naval Paints chart form White ensign Models. it's based on original navy Paint Chips apparently. Of course precisely how the colours look on your device will depend on the settings of the display! But it gives you a comparison of the colours.
Here's a brief history of Cambletown, ex Buchanan D131 if you want to build the USN version.
https://www.wikiwand.com/en/HMS_Campbeltown_(I42)
From this it can be seen the she operated either in the Western Approaches or on the West Africa convoy routes. So I think that Medium grey (RN02) is a bit dark, more suited to North Atlantic convoy duty perhaps? I would go for Light grey RN03 or M23 Light Admiralty grey for the hull and upperworks with Medium greenish grey RN06 for the decks.
If you want to go 'Cammo pattern' the Western Approaches colours for this are also in the chart.
The colour coats paints are now sold by Sovereign Hobbies
https://www.sovereignhobbies.co.uk/collections/colourcoats-sea/british
I just bought a batch from their German dealer; NNT Modell 😊
Some may not be available (Discontinued) but we can probably find near equivalents; I have several 'conversion charts' for Revell, Humbrol, Tamiya etc. My dealer still had a few tins of a Discontinued colour so it's worth asking😉
Have fun, cheers, Doug 😎