Both look like decent body type birmingham rollers to me. how do they roll is the real proof. if it rolls for more or at least ten feet, its a great Birmingham roller supposedly.
if you need to see if they will roll well or not a buddy of mine fires a shotgun, not at them (obviously) just at the ground or the other way or something and if they are going to roll they will roll then
Toss up fire crackers??? I actually condition mine to startle ect when i whistle hard and sharp, as after do when in loft i then chase with broom flag ect not actually hurting but just so then they fly out or up on command, break to roll ect together, or watch for bop. oddly mostly they kit better if seperating too, so maybe they use same as when chickens do similar sound as alarm call when threat seen by one..
Air horns? could work, just hope they don't startle too much or are too good, or you might get roll downs.. a neighbor of mine had his pair start doing that when would do that or something, and hen dented his neighbors car. he thought the rolling down was just letting them be natural and fun to watch. man before hen started rolling down they were awsome to watch! what got me back into pigeons and gave me roller bug.