Can tokens be converted to different symbols?
Symbols are used to purchase cards wherever they come from (Dice or Cards on your CV).
As you can only use each symbol once per turn, the symbols from your cards are materialized using tokens which are just a convenient way to remember that you already planned to use the symbol from one of your cards and to avoid that you use it twice...

The Arrows are explained on page 7 of the rulesbook and nothing mentions the source of the symbol there:



A symbol is a symbol is a symbol ;-)
And you can swap them wherever they come from...