Hi

I think it should be difference between MPLS L2 VPN and MPLS L3 VPN. Some differences are:

- On L2  the provider is not involved with the client's routing.
- MPLS L2 VPN can work like a point to point example EoMPLS also it can be more flexible using point to multipoint like VPLS and HVPLS.
- MPLS L3 VPN the provider is involved on the client routing and it use MP-BGP on each PE router in order to create a VPN, it is highly scalable and any to any connectivity, fast to implement, etc.

Here you will find a great explanation:

https://learningnetwork.cisco.com/thread/84726

Hope it is useful

:-)