I assume you are mentioning the option to configure a Bitlocker policy in the Endpoint Security blade (Disk encryption policy) and an Endpoint Protection (device configuration policy) and choosing windows encryption?
If yes.. they are the same.. but Microsoft chooses to get all endpoint security stuff in one place.. endpoint security :)
And.. I am not 100% sure.. but it (endpoint sec blade) also uses a better approach to deliver the settings to the device if am not mistaken...
