</font><font color="blue" class="small">( The pictures that you took look like to me there is no difference between the 2 tractors. I don't think there is any difference if the tire is on either side. Just from looking at yours. Thank you for your help. )</font>
I can tell you for sure yours are not on correctly, and yes, it does make a difference in the way the traction is applied. If you look at Jon's pictures in the thread New DK45S pictures, blow it up to full size, you'll see that the treads on the rears exactly match the treads on the front. The arrow points in the forward direction.
Look on the rims to see if they have L and R stamped, I think they do, at least some model had that, I just don't remember which.
John