I don't have my books with me, but here's what I said in my True20 review:
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Fans of the system introduced in Blue Rose will like True 20 and may even be able to port some of the magic over. However, be aware that the system is largely the same and a person that owns Blue Rose could easily run True 20 fantasy games without the need to purchase this book.
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And vice versa. IIRC there's a lot of overlap but I think some of the Blue Rose Arcana are different.