I don't have experience with the seeds but have seen the seeds for sale in some catalogs. Hope that helps

Profusion Zinnia is an "interspecific hybrid" according to what I just looked up on the web but you can always save some seeds and see what you get. I'm sure any zinnia would be quite pretty even if it isn't quite exactly perfectly like it's parent. I mean how bad could it be!!! Zinnias are so pretty! If you want to trade just state that they were saved seeds and the offspring may not be exactly like the parent! To get an exactly "Profusion Zinnia" you would have to buy commercial seed.

Well, if it helps at all, I've been growing the three original colors of the Profusion mixed colors (white, orange, and cherry) from seed I've saved each year for a number of years. The plants have the same growth habit as the original and the colors look the same to me too. I agree with ghoghunter about how to label them, though. Try saving some and let us know how it works!