I think the argument is lost in the symantics. To a degree my long iron swing is the same as my wedge swing, but there are differences, and lately I have been working through the same issue.
The raising up of my right side during the long iron take away creates all types of problems for me. I believe that this poor move comes from a mental image of trying to maintain a similar take away arc and plane as I have with my short irons.
I worked with the pro at my range on a couple of drills for shoulder turns that seem to help, with the key swing thought of trying to hit a ball three feet behind my ball during my take away.
The transition between my short irons and long continues to be the biggest struggle for me at the range, especially when I hit full shots with my wedges immediately before going through long iron drills.