Hi
MSTP and RSTP are different.
MSTP (Multiple Spanning Tree) permit different configurations depending VLANs, and its possible to block one port for VLAN1, and permit for VLAN2.
RSTP (Rapid Spanning Tree) is like STP traditional, but needs less time to reorganiza topology in case of link fail.
Is more easy to have the same type of STP in topology
Regards, Jorge