They look the same but one has a right hand twist, and one left. I'm pretty sure. I have restored a lot of seats and some both twist right, some both twist left and some are mixed, one right one left. As I recall, the saddles on the Corvette's use one of each. If you look at the chassie where the springs go in, one side of the hole is kinda higher the other. If both holes look the same, it uses the same spring. If they look somewhat different, they use one left and one right twist springs. I'll see if I can find a pic showing the difference someplace and post it.
I just looked at the spring you posted a pic of. It has a left hand twist.