doctorwho
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Sorry Doctorwho, I gotta agree with Irishteen on this one.
It depends on what you meant in your question.
Does it matter in terms of Billboard charts if there are two versions of the single on iTunes? No - Billboard combines both.
Does it matter in terms of promotion? Sure, it can.
But I can also say that when I look at the iTunes top 10, NOTHING there interests me. I won't download just because it's in the Top 10. At best, I may listen to a sample of it. I only download songs I know I want, not because I see it in the Top 10.
But a top 10 hit on iTunes can be extra promotion. So blame iTunes for splitting a song into single and album cut. GOYB had the two versions, but both were exactly the same. Furthermore, one couldn't buy the album at the time (just pre-order it), so why it was split is unknown.