Torsion Bars types

Hello!
I am fixing up the front suspension and steering in my 1973 Duster 340. I have two pairs or torsion bars. One set is the one that was in my Duster and the other set i got from a guy who repaced the torsion bars from his 73' Duster 318. Im not sure but i think he said he replaced his torsion bars at some point in the 80's and i have those bars now.

I was hoping you guys could help me out and tell me what the numbers at the end of the rods mean. Are they the same? wich pair should i use? Here are some photos.

Thank you :รพ

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