Confused by this Lily

I bought bulbs of this Lily 2 years ago. The label said it was Lilium oriental x trumpet, the picture showed a creamwhite lily, and this is what I got.

I have a few other lilies, but they are not so tall as this one. 150 cm high!

Another picture.
My question is: which lily specie is this?
Will they come true from seed?

Thay appear to be a LA Hybrid (Longiflorium Lily by Asiaitic Lily) Hybrids do not come true from seed. Does that help?

Mainiac, it does help a bit.Thanks. But since I do not know anything from lilies, I would like to know if the height is a normal height. Since I placed them in the garden in a wrong place: Can I dig up the bulbs and put them in another place.
What is the best time to do that? And what do I do with the small bulbs that grew in the meantime? Do I leave them at the big bulbs, or must I plant them apart?
Jonna

Wait until the stalks die back and then dig the bulbs and place them where you want them (in the fall). The small bulbs are babies and can be moved anyplace you want them. It will take a couple of years for them to mature. Don't plant them as deep as the mature lilies.
Different types of lilies grow to different heights. They are generally taller the second year and the years later than that.