I don't have the TF400s, but I do own a pair of TF600s that also got off CL. They are mirror-imaged with the logos on the inside. The main drivers are also both on the inside. I did a lot of research before I picked them up. Audiokarma has a number of threads on DCM speakers, including an active one right now about TF400s. The mother of all DCM threads is one on the AVSforum though. A google search with " Steve Eberbach" and "DCM" will bring it up. All of the Eberbach designed DCM speakers seem to be very well thought of by owners.
I also found it curious that your speakers seemed to have a different driver placement. But looking at the manual for the TF400 Series 2 it indicates that the drivers are, in fact, asymmetrically placed on that particular model. So I think you do have correctly matching speakers. You could also take a look at the serial numbers to confirm they are consecutive. Anyway, hope that helps and enjoy! I really dig my 600s and think they're very well-designed.
I also found it curious that your speakers seemed to have a different driver placement. But looking at the manual for the TF400 Series 2 it indicates that the drivers are, in fact, asymmetrically placed on that particular model. So I think you do have correctly matching speakers. You could also take a look at the serial numbers to confirm they are consecutive. Anyway, hope that helps and enjoy! I really dig my 600s and think they're very well-designed.