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Bit of a long shot but anybody own the Tough System 2 DS165 tool box?
Looking for internal measurement with only 1 compartment in use.tia
I'm out and don't have time to compare side by side for you, but I'm fairly certain the Magnusson system exclusive to B&Q is identical apart from the branding/colour/clips, unfortunately the only part I didn't buy it's the organiser bit you are interested in.
It's a great bit of kit, really sturdy and waterproof, and if you think it's the same you can just look at it on the shelf in store.
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A quick Google should tell you, these things are well documented. If you're buying a new system check any others you own for cross compatibility first though.