embeds all fonts (even the "Base 14" ones), fully (no subsetting):

gswin64c.exe -dBATCH -dNOPAUSE -sOutputFile=c:/path/to/my/output.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -dCompressFonts=false -dSubsetFonts=false -dEmbedAllFonts=true -c ".setpdfwrite <</NeverEmbed [ ]>> setdistillerparams" -f c:/path/to/my/postscript.ps

don't embed any fonts:

gswin64c.exe -dBATCH -dNOPAUSE -sOutputFile=c:/path/to/my/output.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/default -dEmbedAllFonts=false -c ".setpdfwrite <</AlwaysEmbed [ ]>> setdistillerparams" -f c:/path/to/my/postscript.ps