Well again remember something the chain is only as strong as its weakest link, so you are ending up with 50% of this mind blowing sound from the mundorf being a part of the equation as well, meaning the dueland will not enhance information beyond what the mundorf is capable of in the first place, even if you are only running the dueland on the horns and the mundorf on your woofer.. So all in all your mundorf is probably dictating most of your flavor in combination regardless if the dueland is better or not.
In this case both are important contributing factors.. That being said no doubt the duelands are excellent, but I believe the Mundorf silvers are probably as good, but might take a certain application to show it. And yes over time the caps will sound different regardless.