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The difference between major revisions is, well, major. I wouldn't recommend trying this setup. You're better off removing 2.7 and installing 3.x as a post-provisioning step. If you're curious about the differences, take a look at the 3.0.0 release notes, specifically for things marked 'BREAK':

As for hiera, you're in better shape. Hiera functions are executed on the master, so a version mismatch shouldn't be an issue.