Given the track record from the costumes of Rogue One display, I am very wary of any references that aren't actual screen grabs. The Topps cards for instance.
I went through the movie and tried to pause and compare guns. The main issue is Edrio has such little screen time. It is hard enough to see a full body shot or a shot where he is in focus instead of a quick flash in the background, let alone his gun. It is primarily Benthic we see.
Also, the available streams aren't bluray quality and when you are trying to look at small details in the background it makes it difficult.
That being said, around the 36:45 point, Benthic is in the foreground and Edrio in the background both with guns. This is the part where they are capturing the Rebels in Jedha city to take them to Saws.
Take this with a large grain of salt because it isn't exactly clear but there does seem to be a noticeable difference in the guns. Maybe Edrios has a shorter/ wider barrel?
Like was mentioned, we will learn more in the coming days.