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JACK'S BACK:  a 1988 updated Jack the Ripper film directed by Rowdy
Herrington and starring James Spader as twins
 
START THE REVOLUTION WITHOUT ME:  1970, directed by Bud Yorkin and starring
Gene Wilder and Donald Sutherland as two pairs of twins mixed and matched
just prior to the French Revolution
 
THE PRINCE AND THE PAUPER (including the Disney cartoon version with Mickey
Mouse in the title roles), by the way, has lookalikes but not, strictly
speaking, twins.  The various film versions of THE MAN IN THE IRON MASK,
however, do deal with twins--one the king of France and the other, the
title character.