JP, I just measured my 414ce. Measured from center of string to center of string I get:
neck at nut 1-3/4"
strings at nut 1-1/2"
neck at 12th fret 2-1/8"
strings at 12th fret 1-7/8"
strings at saddle 2-3/16"
I cannot speak to the Martin PA series dimensions, but based on your numbers they look nearly identical. When I want a Taylor guitar, I just buy one - not Martin's
interpretation of a Taylor. (Sorry, I could not resist).