There are different burdens of proof (sometimes called «standards of proof») for different types of cases. (mccormickmurphy.com)
Different burdens of proof apply depending on when a modification is requested. (zulegerlaw.com)
An exclusive right for one person to fish and an exclusive right to fish exercised by thirty people impose a very different burden on the fishery, unless the thirty people are limited to the catch that one person exclusively fishing would have reasonably accomplished. (law.stackexchange.com)