The pickings here are really meagre because theMinor Mode, being Chromatic,
     has no tail, no ANTEs, only a nucleus composed of 3 chords,
          the TONIC [I, (Am)] in the center,
          with the Chromatic DOMINANT [V⁷ , (E⁷)] on one side
          and the COUNTER-DOMINANT [IV⁶ , (Dm⁶)] on the other.
There will be only 2 possibilities of Minor to Major,
     A Minor to its Relative C Major, and
     A Minor to its DOMINANT E Major.

A Minor To C Major

Both the Key of A minor and the Key of C major having the same natural Key Signature,
     the link between them is simple, requiring no adjustment.

A Minor To E Major

In the DOMINANT E Major Circle, a chord has been added at the beginning,
          permitting a repeat of the last 3 chords of the A Minor Circle.
     But this added chord, the first 3 for that matter, could very well be removed.

Minor To Minor