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Why, out of all the bands that have gone through such monumental lineup changes (Pink Floyd, Fleetwood Mac, etc) they are the only ones that seem to have become firmly labeled with "version" numbers is beyond me. Perhaps it's because the lineup change has such a drastic overall effect on songwriters--we can say "Barrett-era Floyd"¹ and "Peter Green" and "Bob Welch" and so on, to notate the controlling voice's change. I don't know--anything would be just a guess, and it's likely just an indicator of the varying mentalities of fans that Deep Purple's chose that approach.
Still, "Mark II" has its place highest in the echelons of music, particularly for being so thoroughly entrenched in hard rock when it was rapidly morphing into heavy metal (though most of the albums at the time given that have largely sloughed off that title as it has gained higher and higher minimums of power/volume/aggression/speed/etc over the years). Indeed, if the average person can assign anything to the name "Deep Purple", it is probably "Smoke on the Water", their monstrous hit from two albums (and years) farther on, Machine Head. Now, of course, "Highway Star" has gained a measure of fame from its inclusion in Rock Band, so there might be that further connection, but it, too, comes from '72's Machine Head anyway.