In your experience are these interchangeable or are there some noted differences that would recommend one or the other for specific brew styles?
belgium beer has a yeast profile much different than a German style pilsner. So I would say they are not interchangeable based on taste.
I presume you're talking about malt, not styles, though I can understand confusion.
I find no perceptible difference between Belgian and German Pils malts.
That was easy!
With Dingeman's vs. BestMalz, I think I found the German to be slightly maltier/grainier, but maybe it's because I wanted to think that.