

Also memory manager is not required as Skyrim SE is 圆4 and there is no 4 gb memory limit. There are less and less reason to develop for the Legendary Edition due to the inherent benefits to the enhanced game engine of SE so mods are less likely to have versions for both today. Version dublicates the most features of the old Skyrim ENBSeries modification with as much compatibility between presets as possible, except external shaders which differ because of specific differencies between DX9 and DX11. Additionally, a large limiting factor during SE's launch period was the lack of SKSE (The Skyrim script extender, used for many, if not most, mods) which has since released for SE. However this may be becoming less and less common considering owners of the Legendary Edition (Which was generally required for most large mods before the release of SE) received free upgrades to the SE when it first released.

If there is an easy way to make them compatible, numerous authors choose to release and update versions for both. The article linked by Kyle Rone in his comment on your post does offer some reasons why the versions aren't compatible, but is not technically an answer to your question, since it is the other way round.

It would really depend on the mod (some could work 'out of the box' or with light modifications), but generally it is safe to assume SE mods won't work as intended for the Legendary Edition or any other version of original Skyrim.
