Yes you can, and yes they are. It's really a shame that Feather doesn't make a blade that is injector-sharp but full-length. Or maybe they do and it just isn't imported? But then it's also a shame they don't make a razor that is the full 2.75"-3" length of a standard straight, you don't need the entire length for the whole face but there are large swaths of cheek and neck where it's awfully handy.

I suspect that the Feathers are intended more as hair shapers and nape trimmers than as full-face razors, which would explain why the "super pro" blades are less sharp and last longer than the normal blades.