They both give smart routes, calculated on historical (or not) traffic data in relation to time and day of the week. Therefor the route calculation may differ depending on the time of day (to avoid daily traffic jams). .fsp files come trough the map provider 4 times a year, .hsp new files come every month. So.hsp is more recent and holds traffic information that may differ from .fsp (e.g. recent road works). Those data may give different results that are in contradiction. And that 's why.
edit: typos corrected



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