Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
difference [ˈdɪfrəns] n (dissimilarity) разли́чие; (:in size, age) ра́зница; (disagreement) разногла́сие
it makes no difference to me мне всё равно́
a difference of opinion расхожде́ние во мне́ниях
to settle one's differences ула́живать (ула́дить*perf) разногла́сия
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.