In Macbeth, how does Macbeth’s situation at the end of Act 3 compare to his situation at the end of Act 2?

At the end of both Act 2 and Act 3, noblemen are
suspicious of Macbeth and his actions.  At the end of Act 2, Macbeth has been named the
next king, and all plan to go to Scone to see him crowned.  Macduff, however, refuses to
go to Scone and says instead that he will return home to Fife.  This act of disrespect
for the new king suggests that Macduff is suspicious of Macbeth and at the very least
suggests that he thinks Macbeth will not make a suitable king.  By the end of Act 3,
Macbeth has continued to murder those who stand in his way and decides to return to see
the witches for another prophecy.  Lenox, however, has put together that men are
disappearing under Macbeth's rule and is worried that something is amiss.  So at the end
of both acts, Macbeth is under scrutiny by members of the
kingdom.