I would assume it is deliberate, if the CD and download are the same. I checked 'Festival of Immortals' from the Larian Vault CD download (2:56 ogg file) and the GOG soundtrack (3:17 mp3). The faster songs are probably just remixes of the originals; WMP says the full Musica Divina CD is 56:52, so they didn't have to speed anything up to fit it all on the CD, anyway.
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