Random question about motor mounts

[Ultrasummer]

So I pulled the engine out of my 1968 C10 today. When looking at the 2 motor mounts toward the front of the truck, They appear to be different from each other. Could this be that because of the torque or rotation within the engine one is more stout than the other? Or could it be someone's been in here before and didn't care if they were both the same or not? Everywhere I look for buying new ones...they both look the same. For that matter, is there a left and a right?