The experimental spectrum says ‘arbitrary units’, which by definition does not allow for a quantitative comparison. Over which time interval were those counts measured? Are the experimental counts divided by the energy resolution? When plotting a spectrum, the number of counts in an energy bin must be divided by the bin width (otherwise it arbitrarily scales with the latter).
FLUKA results, when multiplied by the source activity (Bq), shall be intended as count rates (per second) over the energy bin resulting from your DETECT card resolution (i.e., 1.6 MeV divided by 1024 channels = 1.56 keV).
In short, you should compare the two spectra after expressing both of them in counts/(s keV).
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