I would say there actually IS a difference in the way they are treated. Late rated folks tend to be a little more mature and commanders usually will give them squadron jobs more appropriate to their rank.
I’ve even seen a late rated co-pilot who was a flight commander.
There are really two groups;
1. Dudes/dudettes who were Navigators then went to UPT – they tend to upgrade very quickly and almost always get good job in the squadron.
2. Dudes/dudettes who were went to UPT after stating off in a non-rated billet. It has been my experience that it takes them a little longer than the prior rated folks to learn the ropes, but they still learn quicker than the young guns right out of UPT.
One thing to watch out for, they may try to give you such a good job that your flying suffers. I can think of two dudes off the top on my pea brain who were pushed towards career development jobs (Wing Exec – Chief of Plans), and let their currency suffer. While I appreciate that you are in a position in your career where you need a job to help you get promoted, you walk a very thin line of credibility when you fly once every ten days and it takes you two years to get enough hours (even with a waiver), to upgrade.