idiom help

[Zorae42]

I've heard "two sides of the same coin" before, and this site even has the definition, but we're reading Rosencrantz and Guildenstern are Dead in english, and it uses the expression, "same sides of two coins"... what does it mean?

 

[Tdol]

They are two people (two coins), but virtually indistinguishable (same sides).