In Macbeth and Hamlet, there are two women who agree to the destruction of another in order to make their lives more powerful. Both women, Lady Macbeth and Gertrude, are involved in plots to kill innocent kings. While it never directly states that Gertrude wanted Claudius to kill her husband Hamlet, she obviously wanted to marry him; otherwise she would not have married him. She so desired position and staus so she married him in a hurry.
Lady Macbeth is deliberate in her desire to see her husband crowned king of Scotland. She desires the power and prestige of being Queen of Scotland.
Both women are living with a horrible secret. If Gertrude does not know that Claudius killed her son's father, she does marry him knowing Claudius is her son's uncle.
The similarities between these two women are their desires for status and prestige. Both women are living with murderers. Both women desire to be powerful.
Both women die during each husband's term of being king.
There is a deeper connection between these two women. There husbands are guilty of murdering kings in order to take over the position of kingship.
The question is whether or not both women were in on the plot to murder the kings.