Sand channel, PSP, Marsden matting

[cletrac (RIP)]

I doubt if they made any sand channels specifically for the job when they had the airfield stuff. In some of the pix if you look close you can see the links along the edges to hook the planking together. You have to remember that the US didn't get to North Africa until the action there was almost over so the planking would be from a Commonwealth source. The US matting was produced mainly for the Pacific theater. The high manganese content that kept it from rusting wouldn't have been necessary in the Sahara.
The US planks have the pierced holes in rows of three while a lot of this African stuff has them arranged like the 5 on dice. There's a few other patterns there too.
Having said all this, I can't imagine anyone noticing the difference if you hung a US piece on the side of your CMP. Any of it is close enough in my estimation.