There is no RSA or Slip Arrangement among ASR_CDG SF and CDG-FZR SF.
These are completely independent trains.
The train board shows both destinations as FZR-CDG Spl is running using spare coaches of both ASR-CDG (12241/42)SF and ASR-CDG ICE(12411/12). This is quite obvious that there is no RSA or Slip Arrangement as CDG-ASR SF departs from CDG at 1730 and CDG-FZR departs from CDG at 1930... So it is neither possible that there is RSA nor Slip Arrangement