The BCCK Thermal Detonator in the game uses the same skin as the normal Thermal Detonators.
The SE-14R in the game uses the same skin as the ST-1 Pistol.
The Imperial Engineer that is on Rhen Var and on Hoth, are called AT-AT pilots. They are selected from the strongest Stormtroopers and must have an excellent sense of balance. They wear no armor as they are trained and brainwashed that they are invincible.