Not really. A few inches each direction I’m sure. What year A are you talking about? A 30 is larger than a 29.
It sounds like you need a few measurements of the 34 cab. Just so happens I’m working on mine today. Front cab width measured at top of roof approx 48” Rear cab width measured at top of roof approx 54” Cab length measured from cowl to back of cab Approx 51”