Mixing OmniFocus versions & sync

Is it safe to mix various OmniFocus versions (1 and 2) between Mac and iOS ?

I ask this because I still sometimes get the dreadful syncing error where you have to either keep your local DB or erase it with the server one, thus losing your changes made from one platform.

There should be no issue, since all versions use exactly the same database version.

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just to confirm (it sounds like yes), will I still be able to sync & run Omnifocus version 1.10.5 on (old) iMac running OSX 10.7.5 if I update my ipad 2 to the new version for ipad? TYIA