'They all look the same.'

— What ?  No - I'm sorry,
I think you're looking for the other Caucasian. 
The person down the corridor who looks nothing like me,
has a different last and first name, and is Moldovan.
Or, if you like, South Ruthenian.  
I'm Irish (Northern), and male.  She's female,
but has the same mousey-coloured hair
and big European nose and wears glasses
a different shape from mine,
so I understand your confusion.
Have a nice day!