Each hand painted yarn is unique. I have a book by Laura Bryant that actually shows you how to figure out what the repeat length of the colors are and how to figure out where to start on the yarn color wise to get what pattern in the garment. She calls it the magic number.
I have looked at how to do this but haven't sat down and figured out how to actually do it to get the results I want.
I do know that at my LYS I've been told to change skeins every few rows with hand painted yarn to avoid the pooling that makes weird blotches show up that aren't all that attractive in a garment.
Hope this helps.