wouldn't it be because of the 3" versions?

to say just CD means it could be either, and that would be not specific enough for a site like Discogs, so they specifiy that it is CD5"

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serpmusic.com

CD-maxi = CD5 I think

We in Holland mostly have 2 types, the one with radio edit and extended and one with remixes, the last one is CD5

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Way Out West - Surrender [Hope]
Marco V. - Environmental Solution [In Charge]
Rex Mundi feat. Susana - Nothing At All (Elevation Remix) [Coldharbour]
Mat Zo - Default [Anjunabeats]