I own the new KO’s and once upon a time owned the original NECA versions, but it’s been so long since I sold them that my memory can’t do a 1:1 comparison. But I will say they are, I think, as good as what I remember the originals being. NECA got a lot better over the recent years, and the originals, while great, did feel a bit fragile and had some paint goofs. I think there is a video on YouTube comparing the new bootlegs to the originals that I found when considering buying them, but not entirely sure.
That said I don’t know how or why the new bootlegs started using the original packaging or suddenly made bases and the extra accessories. Maybe it’s because the last wave of KOs got so bad that a different factory wanted to differentiate themselves as sales declined. Funny enough, for a while the actual good KOs were going for a pretty penny on eBay, since the recent wave at the time were so bad.
I suppose it is possible someone in China found a crate of original product that was lost or stolen, but it seems unlikely. It’s been so long and they could theoretically sell them for more than $20-$30 a pop