Link comparisons

Apologies if this is mentioned somewhere, I’ve looked and not seen.

Is it possible to track a link to a given third party as followed from various sources, be them on the same page, or separate pages?

So;

10 users click on Link A on page 1
2 users click on Link B on page 1
5 users click on Link C on page 2

and then we can determine Link A on page 1 is more potent than Link B, etc.

Have I overlooked the obvious? Probably. Thanks in advance -great product.

forgot to mention, the link is to an external site, so campaign tracking will not work. Have tried custom variables -but to do that you need to create a new piwik instance/hit which surely skews results?