Some more information. The character is part of Task Force 99, Seargent Kreel was seen as a specialist so this character is homed under Special Opps, I would think the trooper you are referring to would also go to Spec Ops
Sergeant Kreel, designated Agent 5241, was an undercover stormtrooper and SCAR trooper of the Galactic Empire, serving in the 501st Legion under the direct command of Darth Vader. Kreel was given command of an elite group of SCAR troopers, designated Task Force 99
Spec Ops also home Task Force 99: Cav https://databank.501st.com/databank/Costuming:Task_Force_99:_Cav
More references of your character "Shrap" (rear trooper in first image) https://comicvine.gamespot.com/shrap/4005-162019/
Someone was building some of these troopers, Facebook https://www.facebook.com/profile.php?id=100061258101660