Here is another update, as well as a request for some advice (perhaps).

I finished off the piece I started in my last post.

After applying home-made wash to the the base coat:

Then dry brushing to brighten it up a bit and add some more texture:

And finally, a look at how we may use some of the various pieces I've created to make a 3x3 board. Add some of the barricades from the box and we've got a decent table for the core set I think.

Here is my issue - you might be able to see it in the above picture... but the newest piece is a bit darker than the others. In my older posts I mentioned that I used two washes - one was a redish hue. I didn't use that for this piece, for a couple of reasons, but now I am regretting it because the shade is a bit different. Now, on one hand, deserts aren't consistent colour for miles around, so I could use that argument. On the other though, it would be best I think if it all looked the same. Here is an example to the colour of my older pieces - compare this to the colour in the 2nd picture and hopefully its a bit easier to tell.

Anyway, given that I have already dry-brushed and everything, if I go back and try to use the two washes OVER my existing wash and drybrush, do you think that will be fine? It would mean I would have gone basecoat -> wash -> dry brush -> wash #2 (red) -> wash #3 (black again) -> re drybrush. Any issue with doing this to try and improve the colour? Or will I potentially make it worse?

I ran into a similar issue the other day painting some dirt pieces for my table. The good thing about painting is you can always add more layers. I bet if you hit it with one or two more layers you'll be able to get it to match pretty close. Or you can always paint the others to match that one if you want. It's a good color too.