I do believe that the '74 TX650A side stand is different. I rejuvenated a '74 a couple of years ago that did not have one at all. Looking up the part number (I tend to use Speed and Sport's website for that, but there are others) it seemed a bit different. I was able to find that part number (either from them or eBay). The stand is different from the ones on my '77 & '78 (both standards).
I will try today to take a pic of each stand extended on the bikes for comparison, and post them up.