The only differences that I know of are the solenoids. The 722.320 has one used for upshift delay during warm up period (right rear of transmission). The 722.358 has an additional one at the front left side of transmission. I forgot what that one is used for.
The two transmissions are interchangeable. You'll just have a solenoid without a input wire.
What is this for? Are you planning on changing your transmission?