[Idaho2018GTPremium]

Gen 7 Mustang things that copied the Gen 6 Camaro:

Door lines
Rear quarter/fenders
Rear seat windows (slope up now like the Camaro)
Hood scoop (looks like SS scoop)
Horizontal styled front end, somewhat more boxy like a Camaro compared to a S550 Mustang.
Here's one most people probably haven't noticed, but the way the rear scoops inward at the tail light follows the same lines (in a side view) of the 2019 Camaro with the refreshed taillights.
Edited to add:
Side markers