Edge and node Id conservation between different graphs

I just have a question concerning the edge and node IDs. If I build two different graphs (with the importOrLoad() method) with the exact same parameters and the same OSM file, wil they have the same edge and node IDs ?

Yes, if it is the same import code and the same OSM file then it should be the same, see https://github.com/graphhopper/graphhopper/issues/556

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