$ pdffonts onepage-lualatex.pdf
name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
KBBDIF+CMR10                         Type 1            yes yes no       4  0

$ pdffonts onepage-xelatex.pdf
name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
WEDQOW+CMR10                         Type 1C           yes yes no       4  0

$ ls -lh onepage-lualatex.pdf onepage-xelatex.pdf
-rw-r--r-- 1 patrick staff  17K  4. Mai 22:10 onepage-lualatex.pdf
-rw-rw-rw- 1 patrick staff 4,9K  4. Mai 22:08 onepage-xelatex.pdf