340 engine mounts

What is the difference between these and the 318 brackets?

Just asking because my 340 car has a 318 in it and the rubber biscuits are twisted as if the previous owner forced the engine to fit. I now wonder if they used the original 340 brackets.

Thanks for any help.

Art

318 340 360 all use the same passenger side mount.

Drivers side the 318 is different than the 340 mount.

Drivers side 340 works for a 360.