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.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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