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It's not an easy task to id these metallic flies and in many cases you will not be absolutely sure from photos.
As a broad rule the M vein of Callophoridae has a sharp bow while the Muscidae's is obtuse-angled.
To be sure with Pyrellia/Eudasyphora you will nee a good photo of the thorax and the anterior postsutural intra-alar bristle: Pyrellia's is absent, Eudasyphora present.
I can recommend a nice book of 2021 from Olga Sivell with a section look-alikes where you can see the differences of the metallic flies (Calliphoridae, Tachinidae, Muscidae):
https://www.royen...rhiniidae/