I think the linkage from your operator's levers to those right angle crank arms are different lengths, if the clutch packs are both in the same relative engaged position.

Apologies Clayton, I misunderstood the issue. Yes, I see the difference in where the yokes sit. You can take some reference measurements to see where things sit. For example, from the rear, innermost surface of the steering clutch hub to the side of the transmission case, on each side. If there's a difference between them, then check the distance that each side of the bevel gear shaft protrudes from the transmission case. It could be that the shaft is moved over to the side some. I don't know if it's possible for the bevel gear to be installed on the "other" side of the shaft flange but just thinking of possible reasons. For sure there could be a difference in yoke shape. You'd have to pull them out to compare. Scratching my head as to what else it could be other than the way the release bearing is installed in the yoke - that could also be something worth checking. From memory I think it just sits in the cup and a fastener of some description holds it in.