It probably depends on which green you expect. The UK Mk1s and early Aussie 850s used a darkish green which I'm guessing is what the POR stuff is.

Did you know that there is a series of British Standard colours that were used extensively by industry and the military? According to the Mk1 Conversions forum, British Standard Middle Bronze Green (BS 223) was most common but some cars had Dark Bronze Green.

Tim

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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian