I can always tell Sunsprite blooms because the outer petals often seem to quill a bit, making them look almost rectangular as the flower ages, plus the blooms really shatter easily. Also, I used to have Sun Flare (is that the one you mean? It's a floribunda), and it wasn't as brilliant or as clear a yellow as Sunsprite. I still have Sunsprite because even though the blooms shatter quickly it is a bright, clear, more lemony yellow, whereas most of the yellows I see have a slightly more golden tone -- plus I love the lighter green glossy foliage. Or is it that the petals on Sunsprite seem a tiny bit more transparent, making them look more lemony? Here is my Sunsprite:
And the new yellow floribunda I just got, Walking On Sunshine, is also a bright, clear yellow -- love it!