Word for "someone who does the same job as me"

Is there a word that means something like "someone who does the same job as me"?

I've thought of colleague and co-worker. These both indicate that someone works at the same place, or some other kind of work relationship, but they don't indicate that the job is the same.

The best I've come up with is my fellow-X, but this feels cumbersome.

My Webster's lists the following synonyms for colleague:

coworker, fellow worker, workmate, teammate, associate, partner, collaborator, ally, confederate.

None of these really work in the sense you're looking for, something that means "in exactly the same job" as you.

If no one strikes gold for you here, I would suggest that one alternative for you is to be more specific about the actual job function:

My wife is a periodontist, just like me.

Jean and Kate were both trial lawyers.

Here are a few traits I share with my fellow QA consultants at IBM: [List]

Ed and Bill and I have a lot of disagreements, but we're all teamsters and we stick together.

When organizations of similar size, states, or armies liaise, I have seen "counterpart" used quite often. Example;

...said Navy Capt. John Kirby, spokesman for the top U.S. military officer, Adm. Mike Mullen, who spoke briefly by phone on Monday and Wednesday with his counterpart in Cairo, Army Lt. Gen. Sami Enan.

obviously, it's only usable in that limited context of two structures/organizations interacting (as @Dour points out it can not be used to describe two equal-ranking colleagues on the "same side"), so it may not be what you are looking for.