according to the deskthority wiki
Cherry MX Black    MX1A-11xx    medium stiff (60cN), linear
Cherry MX Grey            MX1A-D1xx    stiff (80cN),              tactile
Cherry MX Dark Grey    MX1A-21xx    stiff (80cN),              linear
Cherry MX Green    MX1A-F1xx    medium stiff (80cN), clicky
i honestly can't feel the difference between a ghetto green and a real green but i can definitely feel the difference between a green and a green with a Dark grey spring.
EDIT:  sorry for the mix up.  the spring i pulled it from was DARK grey linear not a regular grey tactile.