There is a Non-breaking space (Hex: A0) not a normal space (Hex: 20) between “48” and “kHz” for “AVI DV NTSC 48 kHz” and “AVI DV PAL 48 kHz”.
I copied the name of the output module from the preferences of the output modules to an editor with a hex representation and found it there.
So my workaround is now, that during the creation of the templater-options.json I check the output modules names for these and replace the space character with the “correct” one.
Beware: “AIFF 48 kHz” has normal space between 48 and kHz.
As a side note:
Beware: Templater-options.json has to be encoded in utf8. Conversion might loose these space differences.