For anyone who is wondering... Skin Food BB cream's 'light' colour closely matches MAC's NC 15-20 shades and 'natural' colour closely matches MAC's NC 20-25 shades.
I found NC 15, NC 20 and NC 25 shades on this product's page (I don't know where else to view MAC's shades for everything):
http://www.maccosmetics.com/template...T_ID=PROD11370