Flower IDs

Found two nice looking flowers in the yard. Both are next to each other, and I don't know what either are. Figured I would make a post to ask. Both look nice, if they are easy to grow and aren't too invasive I could try scattering seed pods in undisturbed locations - insects seem to pollinate them both.

Pretty flowers!

The yellow one looks like birdsfoot trefoil: https://www.oardc.ohio-state.edu/weedguide/single_weed.php?id=104

The purple one should be centaurea jacea (at least that is the variety we have here in Europe).

Yellow one seems to be birdsfoot trefoil, non native and a bit invasive, but smaller insects appear to enjoy it. Pods are now developing, should be easy to save seed if the pods don't burst right after drying. The purple one does seem to be a centaurea species, another non native invasive. Don't know if its jacea, those seem to get tall flowering stalks and the flowers look a tad bit different - saving seed should allow me to grow the plant properly, might be able to figure out better. It is the only one I can find online with the flower color that is listed at invasive in the U.S. though.  Wood bees here really like it though. Only one plant of each of these - and right next to each other. Thanks to both of you for the help!