Is it possible to change the couplers on a car or train from moose horn? couplers to knuckle couplers?

Is it possible to change the couplers on a car or train from moose horn? couplers to knuckle couplers?![]()
If you can't get it take a clear picture of it and we can come up with a plan.
Josh's advice on couplers is the best IMHO