Are you only comparing file sizes in Kilobytes/Kibibytes? Note there will be a rounding factor - i.e., Windows will report a file of, say, 900 bytes as "1 KB" because it rounds. You can right-click and select "Properties" to see the file's exact size in bytes and even if they are the same size, the only way to really compare those files for information changes is to check their hashes or compare the 2 files in a hex program such as HexCmp.
Historically, there are some known anomalies such as AU/NZ and Eastern Europe not being updated despite they appear to be so. See note at the base of initial post here: [Only registered and activated users can see links. ].
Also, albeit unrelated, in modern terms 1 KB = 1000 bytes and 1 KiB = 1024 bytes. Note that Windows uses the original binary kilobyte (1024 bytes), so when it says "KB", it is stubbornly resisting the 'new' definition of the decimal 1000 bytes.
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