Via an official HHonors representative on FlyerTalk, Hilton HHonors has a status match program. Email a request to HHonorMyStatus@hilton.com with your HHonors and something showing your elite status in another program, and see what happens! Send your request by January 11, 2016 and you’ll have the matched status through March 2017.
Since you can automatically get either HHonors Silver from credit cards like the Hilton HHonors American Express or the Citi Hilton HHonors Visa Signature, or HHonors Gold from credit cards like the Hilton HHonors Surpass American Express or Citi Hilton Reserve card, I would say it’s only worth it to match to Diamond or possibly Gold if you have neither credit card.