Does my 20th Anniversary Model have the same electronics as the Mark King Standard model?

Not exactly.  
 
Unless the 20th Anniv has been modified, you should have 2 volumes, 2 filters, and 2 Q's, plus the mono/stereo switch and the pickup selector.
 
The Signature electronics have 1 volume, 1 pickup pan, 2 filters, and 2 Q's.  Also, the Signature is mono only.
 
I'm guessing that the idea behind the 20th Anniv was to have it be a 9-volt version of the Series I.
 
Mica, please correct me if I'm out in left field.
 
C-Ya...........wayne