http://www.prsguitars.com/csc/neckprofiles.html
Neck Measurements
WIDTH OF THE FRETBOARD AT THE NUT:
Pattern, Wide Fat - 1 11/16"
Pattern Thin, Wide Thin - 1 11/16"
Pattern Regular, Regular - 1 21/32"
12 String - 1 47/64"
WIDTH AT THE BODY
Pattern, Wide Fat - 2 1/4"
Pattern Thin, Wide Thin - 2 1/4"
Pattern Regular, Regular - 2 1/4"
12 String - 2 19/64"
NECK DEPTH AT THE NUT
Pattern, Wide Fat - 27/32"
Pattern Thin, Wide Thin - 25/32"
Pattern Regular, Regular - 27/32"
12 String - 27/32"
FINGERBOARD RADIUS
10" on all guitars except when otherwise stated
11 1/2" on the Santana models and 12 strings
SCALE LENGTH
25" on most models except when otherwise specified
24 1/2" on the SC 58, Santana, Starla, Starla X, Mira X and 245 models
25 1/4" on 513, DC3, and NF3
25 1/2" on 305
...so you can see that the Pattern Regular neck you played is actually thinner at the nut than your Wide Fats.
I would also like to point out the the "Pattern" naming convention is very bad in this day and age of internet searches. Say I want to find a 408 standard with w/ a trem and Pattern neck. Any 408 standard with a trem and Pattern or Pattern thin neck will come up. Sure, I could also put "-thin" in the search right? But it's a pretty common word and could be used elsewhere in the text. When it was called Wide Fat I could search "Wide Fat" with the quotes and get what I wanted. They should rename it "Pattern Fat" or better yet, make a fatter neck profile and call that one "Pattern Fat" 'cause that's what I really want.