Currently there aren't visual ways of differentiating between different dank nulls in your inventory. You can only use names which require the user to hover over the item to find which dank they are looking for.

Instead, if danks could be colored using dyes similar to the way shulkers are dyed, you could tell the difference between multiple danks at a glance.

They're already colored differently based on tier, adding another layer of coloring on that would be a disaster