1/2 ton vs 3/4 ton lower control arms

[mars636]

I need to replace my lower control arm on my 67 c10 1/2 ton, can anyone tell me the difference between the the 1/2 ton and 3/4 ton lower control arms? I found a control arm at the local scrap yard, the truck it came off didn't have a vin or any spindles/axles, so I couldn't tell if it was a 3/4 ton. it looks almost identical as my 1/2 ton arm just the steering stop is a bit different. Also the ball joint out of the 1/2 ton can be pressed into the scrap yard control arm by hand. The size, width and length is the same.