probably close enough for government use.
If concerned, buy a can, spray a small test sample on a piece of metal an check it out beside a late model mf tractor frame, if close, you are good to go.
i think the color that you see fergy tractor frames painted, from time to time, that does not match is: battleship gray
I have used that color to paint old ferguson implements, but it is not the proper color when you hook the implement to the tractor, then you can really notice the difference in gray colors.
But mainly i am just covering up no paint and rust, so battleship gray does look better than rust.
I am a big fan of Orshelns spray paint, i think the name of their paint is sp (van sycles) that is some of the best spray paint that i have used. my local store has Fergy colors or they can order them.