Yes, they would look the same as on a non-retina MBP. The point is that when placed right next to the Retina apps, the difference would be jarring/distracting.
That's possible. Assuming you use any retina apps, of course. I'm looking at the apps I'm using right now, and none would actually be making full use of the retina display on a retina mbp.
I guess if/when I ran iPhoto it might look jarring. If I weren't running it full-screen on its own desktop, of course.
All of which is to say that it really depends on individual usage patterns.
