Linda Lavin -looks exactly like Valerie Harper quite a bit.

Which actor did you think resembled so much another one?

Neither one does a LOT of TV but.... Uma Thurman & Sarah Polley could be twins! (If one wasnt so much older than the other )

Then there's Dick York and Crispin Glover

Richard Keil ("Jaws") was often mistaken for Ted Cassidy (ADDAMS FAMILY).
They were both nearly seven feet tall.

Walter Koenig (STAR TREK) is still mistaken for Davy Jones (THE MONKEES).
No wonder .. they could be twins!