There are no major changes in the REST API from NPM 10.5 to 11.0. You can use NCM 7.1.1 with NPM 11.0.
Note that if you upgrade NCM to the latest (7.3.1) you will be able to access NCM data through the REST API as well. (Pre-7.3, NCM data had to come through SWISv2 and SOAP.)