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The Army Painter Rattlecans and Pots do a pretty good job of colour matching, it's always going to be a struggle to get an EXACT match but they come very close with most.

Especially with Dark Angels my approach would be to get an all over black undercoat, then any missed areas from the green will most likely be in the deepest recesses giving an element of zenithal shading.

From here I'd do a quick patch test on one of the models to check how well the pot and can match, assuming you're happy with it matching then don't worry too much about re-coating.

As you're already planning for a fair amount of rattle can work, my next step would be a light coat of gloss varnish before shading it with inks/washes as this will help them to get and stay in the recesses giving you sharper lines between panels.

From here highlight in your preferred way, for a good "tabletop standard" I'd go for one subtle highlight followed by a sharper edge highlight on the upper surfaces.

Rik