That's unfortunately not possible because of the different versions of confluence. In fact, you can create a space export and import into a confluence from the same major version (E.G. 4.x.1 into 4.x.3) however you can't import content from different major versions (E.G. 4.2 into 4.3). In this case, you need to get both versions equal of confluence and then you can import the content.
About the best practices of backup and restore, please look into our backup strategy documentation: https://confluence.atlassian.com/display/DOC/Production+Backup+Strategy
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