There is no real difference between a height map and a displacement map usually, however there is a small difference in the meaning of the names. In that case the displacement map would usually not be called a height map. In that case 3 values are stored in the image to define the offset of the surface in 3 directions. Displacement maps can also consist of vectors. This kind of a map can be used as a bump map or a displacement map depending on your needs and choice.
This usually means that black is the level of the surface and the lighter it gets the higher off the surface it is, however it could be implemented the other way around in some rendering engine and the maps could still be called the same. Height map means that it has values of height from the surface mapped to color values in an image file. The thing is that these texture (mostly or entirely, i guess), are made for Zbrush While in this other, instead, the height map looks more like a displacement map: You can see the same happening here in this texture pack: The thing is that in a displacement map, a valour means sinking and the other lifting, but in the second texture group you can see that a black valour(which is sinking), is in a place where in the colour image is not sinking but lifting instead (a lifting flagstone). If not, where should i connect it in the node editor? The thing is that i need to know what does this map mean. At first i thought it was the same thing but after watching closely, they don't seem to be the same (or maybe i'm bad at observation). The thing is that some of these have a displacement and some others have something called "Height".
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