One is a campagnolo record rear caliper and the other is a campagnolo chorus rear caliper.

I’m including an extra long mounting bolt so perhaps you can use it as a front, but I do not guarantee that you can. Also don’t forget to switch over the pads to front orientation when you use it as a front.

Please take a look at the pictures for condition.

They almost look new. There maybe a few light scratches but there is no rust.