Bundled discounts with partially owned content (Digital)

I would like to purchase some adventures, having previously only really bought player options. Was wondering if there were discounts for purchasing bundles when you own some of the bundles contents?

For example, purchasing the adventure modules from Grim Hollow or Drakkenheim. You save 10$ when purchasing the bundle, but what if you own some of the bundles contents and wish to complete the bundle? Are there any discounts for that?

Alternatively, purchasing the Digital Anthology Bundle provides a discount compared to buying each individual item, but if you already own one part of the six part bundle, can you still get a partial discount for buying the rest of the bundle?

I believe not.