I dont know if you read the script, so i dont want to spoil it for you, but the only original in the script is the one that they find tied up, which gets released by royce, which then puts on his armour and fights the last remaining pred which is the bigger bad new guy. The other two preds that were with the SBP, are not on the scene at this time. ANd I think that the part where we have Brody with the lasers on him is where it talks about them looking at him and his heart rate remaining calm as if he is not afraid to die. dont think this is a different ending.