Yup, it's a muddy brown colour called red oxide. In Metuchen they poured anything left over into the barrel (enginebay black, left over body colour etc, so often there's no two red/browns exactly the same.
The red/brown you can buy (or get your painter to mix) and either make it the proper red/brown (and that colour definition is...??) or add some other colours to it so it's approximately red/brown and you'll be good to go.
Remember, they slapped it on and runs/drips underneath are normal and expected.