RSColonel_131st: There's a lot of detailed info out which is easier to google than to retype.
Basically:
Last Light Redux is the game with all DLCs (including Ranger mode) and minor improvements.
2033 Redux is 2033 ported to the better looking Last Light engine, change of character models, change of controls, weapon customization, change of AI and other mechanics.
So Last Light Redux - Game of the Year Edition.
Metro 2033 Redux - making it look, play and feel the same as Last Light.
Thank you for your reply! For some strange reason, I had assumed that Redux versions were inferior because they were made for tablets and other mobile devices...I think I read something like that on one of tech sites...GOG did not make it any easier to explain what Redux means on these games web pages...maybe there is more details on some forum page but it means shite to people who want real info on the games web page!!!!! Whoever is in charge of GOG Marketing is ignorant of what people need to know and where they need this info to be displayed!