Which 8.25 do I have?

So if i swap an 8.25 from a 73 dart to replace the 7.25 in a 69 barracuda (assuming all original stuff), It will be almost an inch shorter per side? Does this create any tire fitment problems?

I cant see where you got a inch shorter per side from the chart above. I see about 3/4 difference overall which would be 3/8 per side to the back of the backing plates but then how far the axle flange stands out could throw it either direction yet again.