Adjective : The two cars are identical except for their license plates. ,This is the identical room we stayed in last year. ,identical opinions.    From Dictionary.com. 

In these people the lack of identicalness is more marked, though not to the extent of being a deformity.    From Wordnik.com.  [Escape on Venus]

She thought we needed to play off our identicalness, that one day we'd learn to appreciate our unique situation.    From Wordnik.com.  [Sorting Through the Identity Crisis Between Blogs and Social Networks: Which is Right for Your Brand? - Jory Des Jardins - MediaBizBlogger] Reference

Coquette tells me that there are many things in the US that have not identicalness with California, but when I imagine the US, I am always conceiving beaches--like Americans with the Tour Eiffel, no?.    From Wordnik.com.  [So Jeanne, What's TV Like Over There?] Reference

There is certainly an identicalness of language between the two papers that is well calculated to strengthen this hypothesis.    From Wordnik.com.  [The Impending Crisis of the South: How to Meet It] Reference

I have entirely forgotten what it was, but deem it no great matter, inasmuch as there is a pervading commonplace and identicalness in the composition of extensive dinners, on account of the impossibility of supplying a hundred guests with anything particularly delicate or rare.    From Wordnik.com.  [Our Old Home A Series of English Sketches A Series of English Sketches] Reference

A pervading commonplace and identicalness in the composition of extensive dinners, on account of the impossibility of supplying a hundred guests with anything particularly delicate or rare.    From Wordnik.com.  [The Atlantic Monthly, Volume 12, No. 70, August, 1863] Reference

While size doesn't matter, identicalness does.    From Wordnik.com.  [chicagotribune.com -] Reference