Well, assuming these varieties are not common in your area, they will be different. Which may or may not be a good thing. Garden junkies will like something different, the traditionalists won't have a clue what you're selling and will probably pass. I suggest lots of handout sheets and sales pitches.

Hardiness zones in parts of Europe (England, I know) don't always correspond well to the US because our summers are so much hotter that some British plants won't do well here, even though they are "hardy".

When you say you got them from Europe. What exactly does that mean? T&M is a "European" company. When you get your seeds from them the packaging doesn't tell you where the seed source is from.
When I buy from Harris (an American company) my seed pack tells me where they came from. So I buy from Harris and the seed source was Denmark. Did I buy from America or Europe?

What I am getting at is how do you know what is the original source for your seed?