There more than probably will be, as the agrellan earth/badlands is exceptionally close to steel legion drab. I suspect what they do is start with a base colour and then add in the crackling medium and the grit, which ever so slightly changes its colour.
A swift google suggests one of bugmans glow, doombull brown, or tuskgor fur. Personally i have no experience with the martian technical paints so if possible see if you can see the bottles side by side before you make a decision
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