There is a great cross reference chart on the Humbrol colour card/sample card or whatever you call it. It list's Testor's, Tamiya, F.S. Gunze, Revell, etc.
You could try writing to Humbrol for one; Marfleet, Hull, HU 9 5NE, England is the address, or maybe a fax to (UK) 01482 712908. As far as I know they don't have a web site, which is a shame, I can't find one for Airfix either, & they are the same company.
Cheers
Pete