What does that mean exactly? One of these 2 mods are not taking effect anymore until they get updated or the effect it′s just different because of the new resolutions?
The normal maps are the textures hidden under the textures that add detail to the models to give them proper surface texture materials. Like the grains in the wood for example or if you look at the cracks etc in the brickwork in that earlier picture. These maps require the origonal high polygon models to create, some of the models will be in the millions of polygon bracket and most PCs would cry, piss thier pants, then fall over dead if they had to produce a scene with all the models unoptimised in it.
The Normal maps can give detail to lower polygon models to reduce the load.
Like in a shooter game for example a gun barrel can obviously have hexagonal model (lower poly) but the surface itself looks completly rounded, you can only see the model is hexagonal by looking right at the end of the barrel though.
These normal maps are created, baked is the process name, from the origonal high polygon models and then used on the low polygon models.
Hope that helps.