Oy. You have a lot to learn my son. First of all, 99% of marketing is complete bullshit. Don't ever make a blind buy based on marketing. Secondly, the two scents are totally different. L'eau Par is a citrus, whereas Air is not. To be honest I haven't spent a whole lot of time with Kenzo Air, but I know it opens with a strong blast of anise and while not super strong it didn't seem like a particularly light or airy scent either. It also didn't seem that great, but like I said I didn't give it much time.
I bet if you tried hard you could find a place not too far from your home where you could test this scent. This isn't a Malle we're talking about. You should just go out and test it. I believe it's on sale at Sephora right now too.
Just because you like one scent, doesn't mean you will like the other scents from the same house. That is a dangerous assumption even for the houses that try to have a consistant image or concept with their scents, which Kenzo does not. The two scents are in different scent families, probably were made by different noses, and are conceptually totally different. I would say that is is far from safe to order this blind. Just go on a testing adventure and have some fun!