SwingUtilities.invokeLater() vs EventQueue.invokeLater()

No there is no difference.

SwingUtilities class was built to combine all general utility methods used in swing to be in one single class. Internally SwingUtilities.invokeLater() calls EventQueue.invokeLater()

1197    public static void invokeLater(Runnable   doRun) {
1198       EventQueue.invokeLater(doRun);
1199    }

Reference: http://kickjava.com/src/javax/swing/SwingUtilities.java.htm