Tell me please, If I have one song in two different versions, I can combine them into one file and sell it? And how in that case, the assembly would cost?
Sorry for my bad english, and when I asked the question not where need.
As far as I know you have to sell the track in two different versions in ONE file! The file would cost the same, it is not more expensive because of two or more different versions. But it also depends on how different the version is. If it differs extremely from the original edit you are maybe allowed to sell the tracks as two different items!
Hope I could help you a little bit 
If the versions are significantly different, you can submit them separately, yes. One remix is allowed separately this way. If, however, the second track is a variation, with the same general theme, then they both versions must be submitted together, in the same upload, and you’ll need to have both versions heard on the preview.mp3, and state the length of both files, in the description.
Hope that clears it up for you. 
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