From Miniature to BIG

Your original one is no.20 and this one is no.22

Spot on, well done mate.  I came across it on eBay, 2nd user, but it would seem apparently OOP as the current version as you say is number 20 instead of 22.  So I grabbed it

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That and...I am sure positively because I can't clearly see but there is a braking system visible in the second image of the #20 wagon.

It's probably the angle, but they are the same including the underside as far as I know, I will check them side-by-side later though just to make sure.  With 2nd user models there is always the risk there is some damage such as something missing...

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Ok, I just checked the #22 has brakes on one side only, referring back to the pictures of #20 that is the same as can be seen in the photos of that as it only has the brake gear on one side also

It's probably due to the fact that these wagons were made to be workhorses and above all else cheap to manufacture and work to death. You'll notice though that those brakes are actually manual as there are no vacuum pipes on these wagons so no way to apply the brakes remotely