Interesting ventralshot - had no idea this genus could appear metallic red?! Will need to check the collection... Genus ID provisional, as I don't have access to specimens at the moment.
On the night of 25 Nov 2019 I have sightings of two flies #4263569 and #4263570. Everything seems to be in order with #4263570: the Dorsal and ventral images were taken 20 mins apart (which is a long time) but the notches along the wing margins match up perfectly.
With sighting #4263569 (this one), the Dorsal and Ventral images were taken 1 hour apart (an extremely long time) but more importantly, the notches along the wing margins don't appear to be exactly the same. These may indeed be two different flies as you're suggesting.