PDF/A (archival standard) requires exact font matching. If a museum or library digitizes a 1998 Chinese news article, the fzchsjw--gb1-0 font must be either embedded or a perfect substitute must be documented. Unresolved font mapping leads to character substitution errors (e.g., "龘" rendering as a blank box).
Since this is a legacy identifier, you cannot simply download a file named fzchsjw--gb1-0.ttf from a reputable source. However, you can replicate its functionality. fzchsjw--gb1-0 font
Common formats and when to use them
Building a font: pipeline checklist
Packaging for web
Inspecting an existing packaged font (for Interpretation B) PDF/A (archival standard) requires exact font matching