You can import 3.5 plugins into 3.6 fine - they get allocated a default execution order of 5.
You cannot import them the other way as a database error is generated. If you manually add the executionorder column to your 3.5 database (plugin table) then you can import 3.6 plugins into 3.5 and they will work fine (as long as the hooks exist of course, many new ones were added to 3.6).
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