They are not more detailed, and in fact, since normal maps are not floating-point, they likely have less detail than an EXR height map. The normal maps are simply a conversion of these height maps. The height maps it makes are internally in HDR space, and thus need to be written out as EXRs (16-bit half should be fine) so as not to lose detail which would occur when going from HDR to the 0-1 range of an 8-bit file. Substance Painter is a paint program (not a modeling/sculpting program) and thus generates all its maps by painting techniques. Substance Painter does not have sculpting tools, and thus cannot generate these displacement maps. A displacement map is one generated by computing the difference between a low res and high res sculpt in a program like Zbrush or Mudbox.
A height map is synonymous to a bump map. You said in the OP that these were coming from Substance Painter as a Height map and Normal map. Here it's important to discuss the source of the maps.
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