Different versions of figures

The free figures that can be downloaded at Daz are LE versions (Aiko3, Millenium Subdragon), some are SR1 LE (Millenium Big Cat and Horse). In my runtime I also have a Michael3 SR1 and a Victoria3 SAE.
I noticed in the freepository that some freebies come in two versions, A3 and A3LE, so they must be different, yet Aiko3LE is the only avaible A3 ?
Are they light versions, or updated versions ? How are they different ?
Comments
Mostly the LE version will be the same mesh and rigging as the full version but will not have the morphs. The SRs are service releases - updates to fix issues - so you want the latest of those - SAE for V3 and SR2 for M3. I think SR1 is right for the Horse and Big Cat.
Thank you, Richard !
Very useful information, thank you!