Are these the right lower A arms?

Rebuilding my front end and took the lower A arms to my work to put in the parts washer and then install the bushings I got for em. One of them has the tab for the sway bar and the other doesn't! It's a 68 cuda and the one with the sway bar tab is in the stock 68 location (right below the strut rid mount) Doesn't even look like the tab broke off, just never came with one! I know this isn't uncommon, but weird to me that someone would change one arm out and not the other... But that's beside the point. My co worker looked at the one without the tab and said "this one looks different" and I assured him that it was just the sway bar tab, but he thinks the bolt (pressed in that goes into the k frame) is different. Is there any differences in early or later a body lower arms? I know b body ones are different where the strut mounts, but the other arm is in so its hard to tell for sure. Any ideas on if this wouldn't work for whatever reason please let me know.

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