I'm not sure, but it seems that way.
 
I had to copy them from the Sonar Themes folder to the Cakewalk Themes folder.

As a reminder, you can get tons of themes here...
 
http://forum.cakewalk.com/SONAR-Resources-and-Utilities-m3392713.aspx#3495949
 

copy them over to the new folder 

I am not sure if this was because of something funky on my machine, but this is the issue I had and how I solved it.

I was not able to see my custom themes in the themes section of Preferences.  I do use some custom lenses, so what I did is deselected themes on my custom themes.  One I did that, I could select my custom themes from the dropdown.

Bump...