The concept of "the custom fit" was not new to the clothing industry. Tailors had been around for centuries, tucking in fabric here, letting out the hem there, and holding fittings to ensure a good fit, but for some reason, the experience was different this time around. Customers could get involved in the process, and it sounded like fun.
All of a sudden, rather than have someone do all of the tailoring work for you, it was cooler to go to the store yourself and wear the jeans while they were heated in vats of hot water and shrink-dried to custom-fit your body. Those buying the clothes were happy to be part of the fad, and those making the clothes were happy to provide the same jeans for more money to more satisfied customers.
Now, legal professionals, you have the unique opportunity to do the same thing to your resume—free of charge. Yes, your experience remains the same no matter what position you apply for, but you can tweak information and include or exclude facts as necessary to portray yourself in the most positive light for each individual position.
See 6 Things Attorneys and Law Students Need to Remove from Their Resumes ASAP If They Want to Get Jobs with the Most Prestigious Law Firms for more information.
Along those same lines, whatever isn't easily explained in a resume shouldn't be explained in your resume. If some of your experience needs a little additional tailoring to make it apply to the firm's desires, address it in the cover letter. Just be sure that all the experiences you allude to are already listed in less conclusive terms on your resume for the sake of consistency.