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Very different compression rate with two similar files

I’m using WinRar to compress two text files, of approximately the same dimensions (80Mb), which contain a Json structured text.

The text is generated by the same program and, inspecting it, it seems there is no apparent difference in the structure between the two files (Json fields are the same, only values vary).

Yet, when compressing them into a Zip file, there is a 1:10 mismatch in the compression rate. Namely, one file gets compressed into approx. 2Mb and the other one into approx. 20Mb.

What could be the reason for such a large mismatch?

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