Different properties between hbjson files


I noticed, there are slight differences in the “plane” “o” of faces, between the hbjson file from “ModelToOSM” (left picture) and “HBDumpObjects” (right picture). The former additionally contains properties “volume”, “ceiling_height” and “story”, but apart from that the files are identical. Should they not be ideally identical?
LBT 1.8.0