currently, no harmonised standards are available for the MDR, so best to use state-of-the-art standards, which are typically the latest revision, in your case EN ISO 17664:2017.
So there is a high chance that your notified body will ask you for compliance to the latest revisions of standards you employ for your submission. One option to demonstrate continued compliance is to perform a gap analysis between the current and the superseded standard revision and address all identified differences in a documented way for your product. In case you identify the gaps as being not significant, you may succeed in establish continued compliance as outcome of this gap analysis.