We have from Yael Kedar's reading of Roger Bacon, as referenced by me above:
A species does not advance in the medium by locomotion; it regenerates itself in consecutive parts of the medium.
If you accept Roger Bacon as the basis of ArM5 sensory species this implies, that sensory species don't really have an identity and that it is a moot point, whether reflected sensory species are 'new' or still 'the same'.
We know in ArM5, that there are magically created or copied species which are still magical, and these can be distinguished by magic.
Using a mundane mirror this should be the case. But using spells like MoH p.101 To See as Though a Plethron Distant is not: there iconic species are recreated and changed by Hermetic magic.