Yes, the Eastern Ukraine rebel flag looks very similar to the N.V. battle flag. The photo I saw was a few years ago, and the flag also had stars, looking exactly like the battle flag. BTW, I thought the Red Army Choir singing “Sweet Home Alabama” did a good job.
A year ago last June, HuffPo ran an item asking, Pro-Russian Separatists Are Flying the Confederate Flag. Why? It was illustrated with a Getty stock image of a torn Confederate flag flapping in the wind. It was a short piece and offered no information as to the image's context. It simply linked to a longer Reason article which contained only the starless version.
If the Ukrainian rebels actually were flying the Stars and Bars, maybe it was because supplies of the Novorossiyan flag were low, and so they ordered "rebel flags" off Amazon Prime.
BTW, I thought the Red Army Choir singing “Sweet Home Alabama” did a good job.
https://www.youtube.com/watch?v=Jrg0X9H6FGU
Down in the comments, Dmitri Cherepovetsky writes, "Sweet Home Crimea!"