Luke,

The question becomes whether you are trying to merge two separate, existing dictionaries or just snagging one that exists on one side and putting it on the other.

If you would, could you please describe precisely what it is you're trying to port, and in which direction?  It sounded like you were trying to get certain things from the installed to the  portable and vice versa.  
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Brian - Windows 10, 64-Bit, Version 21H1, Build 19043  

Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.

         ~Martin Luther King, Jr.