Color choices for Blockly Library Blocks

Is there a best practice for what colors to choose for blocks in new libraries? Should we try to match the OH block colors as closely as possible, or does it make sense to use different color to make the library blocks distinct from the “official” blocks.

In my case I’m creating blocks for an external library (OHRT). So far I’ve been matching color to the OH blocks. But because it’s referencing something not part of OH I wonder if I should use color to make that more clear.