ally
alter ego
analogon
analogue
associate
brother
clone
close copy
close match
coequal
cognate
companion
compeer
complement
congenator
congener
coordinate
copy
correlate
correlative
correspondent
ditto
double
dupe
duplicate
duplication
each other
equal
equipollent
equivalent
facsimile
fellow
image
kindred spirit
like
likeness
match
mate
model
near duplicate
obverse
one another
opposite
opposite number
parallel
counterbalance
counterpoint
countersign
counterweight
partner
ancestry
businessman
centers
colleague
context
diplomat
domination
embassy
entity
immigrant
interpretation
journalist
origin
perspective
representation
representative
ruler
standpoint
version
viewpoint