In uncountable|lang=en terms the difference between differentness and otherness
is that differentness is (uncountable) the state or quality of being different while otherness is (uncountable) the quality of being different or distinct.
In countable|lang=en terms the difference between differentness and otherness
is that differentness is (countable) the result or product of being different while otherness is (countable) the result or product of being different or distinct.
As nouns the difference between differentness and otherness
is that differentness is (uncountable) the state or quality of being different while otherness is (uncountable) the quality of being different or distinct.
differentness
English
Noun
(uncountable) The state or quality of being different.
(countable) The result or product of being different.
otherness
English
Noun
(uncountable) The quality of being different or distinct.
(countable) The result or product of being different or distinct.
References
* [http://dictionary.reverso.net/spanish-english/otredad]
* [http://www.google.com/search?q=define%3A+otherness&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a]