Short answer: Shop2Shop is a separate - more budget friendly - service within Chronopost.
Explanation: Shop2Shop is a separate - more budget friendly - service within Chronopost. Shop2Shop shipments are processed within the same network as Chronopost. However, the transit time is typically longer. Shop2Shop doesn't focus on next day delivery, where Chronopost does. Shop2Shop also doesn't do home deliveries or pick-ups. It's only possible to ship a parcel from parcel shop to parcel shop. For more specifics per shipping method, see the related articles.
Related articles
→ Chronopost shipping conditions (France)
→ Chronopost Shop2Shop shipping conditions (France)
→ Chronopost surcharges and restrictions
→ Chronopost contract activation 🇫🇷