1.20 is the original version released by Project2 across Europe, it had Nick's original logo.
1.21 and 1.22 were both released by Gathering of Developers depending on the retail timeframe, and as far as I can remember, they both had the updated yellow logo. 1.22 should've been available as a file-replacement patch at some point, but I never came across it.
1.23 was solely released as a patch program that patched all retail versions (1.20 - 1.22) to 1.23.
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