I re-watched the White Queen as a refresher on that story before watching the first two episodes of White Princess, and I got confused and had trouble connecting who the characters were in relation to the White Queen. I think having different actors, and their interpretation of the characters, is what threw me off. I had the same trouble with Atlas Shrugged using different actors for the lead roles in each movie. Watching the White Queen first would help make sense of some the things they say in the White Princess, but I don't think it is necessary to see it first if you know the background story leading to the White Princess. Whether you watch it first or not, definitely watch the White Queen at some point. I've viewed it several times and enjoyed it each time.