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Many thanks John, it convinces me! By this work http://www.entomologi.no/journals/nje/2018-2/pdf/nje-vol65-no2-127-174-olsen.pdf it seems that there is a bunch of species in Norway and that specific ID is no possible without genitalia dissection, right? Or there is a prominently more common one that can be assumed to be most probably the one in my photos?

Species present in Norway according to said work:
Molophilus
appendiculatus (Staeger, 1840)
ater (Meigen, 1804)
bifidus Goetghebuer, 1920
* bihamatus Meijere, 1918
cinereifrons Meijere, 1920 10
* corniger Meijere, 1920
crassipygus Meijere, 1918
* curvatus Tonnoir, 1920
flavus Goetghebuer, 1920
griseus (Meigen, 1804)
lackschewitzianus Alexander, 1953
medius Meijere, 1918
obscurus (Meigen, 1818)
* occultus Meijere, 1918
ochraceus (Meigen, 1818)
pleuralis Meijere, 1920
propinquus (Egger, 1863)
pullus Lackschewitz, 1927
serpentiger Edwards, 1938

(Marked with an asterisk are species new to Norway so I assume they're too rare for be a common garden species like mine)

Thanks,
Isidro