Just ask?
Some online degrees state that they're equivalent, but interviewers may still have their own opinions. I would discourage anyone from failing to mention the online nature of a degree in their CV. You're really not doing yourself a favor. A rigorous online degree is something to be proud of. I see people with PhD's proudly announcing their online course certificates on LinkedIn. However, 'discovering' that an education was of a different nature than one had assumed based on the presented materials may raise questions.