[nuclearnerd]

We found the answer is: they're the same. The team versions ramp is 1/2" thick, while the field version is 1/4. Draw both ramps with the top (left say) corner starting at 3" above the floor and the bottom right corner touching the floor, and you'll see the top surfaces are nearly collinear at about 13.5 degrees. The plywood just has a thicker leading edge.

Edit: On second read - I see you aren't talking about the team versions, but the difference between the field drawings and the manual. That difference seems pretty minor to me (the 11.75 gets pretty close to 12" once you include assembly gaps, but I'll let others chime in.