Are results after performing operations on AVL trees ambiguous?
In standard way the order of operations determines the tree shape - there are no ambiguous choices during insertion / deletion or rebalancing so it is unique.

There are more possible trees if you consider some additional operations that do not violate AVL properties like introducing stricter balance or rotating -1 to +1, please remember that this operations are non-standard and changing -1 to +1 serves only one purpose - to show different existing trees with AVL properties.