Flash player 18 esr - does it contain all the features of fp 18?

With the version jump of fp esr from 13 to 18 I'm trying to find information on whether we need to do extensive testing on the new flash player 18 esr release, but it doesn't seem clear to me if the new esr version is identical to the full version, or if it is just 13 esr with a new number and the latest security fix. Does anyone know where to find information about this?