It think different from (P1889) statement is an unnecessary noise in most places where you add it. Per property description it's not meant for linking to any item with identical label, but "another item, with which it is often confused". For instance, it's quite hard to mix a disambiguation page item for anything else, as far as user isn't entirely careless and at least briefly checks the page. (An exception to this may be items on person names, as these might get mixed indeed due to Wikipedia versions having different approaches to listing persons on disambiguation pages.) You however apparently add "different from" to any topic that on Wikipedia links to a disambiguation page, e.g. here.
If different from (P1889) is used I'd expect that other concept being linked is similar, or topics overlap to a considerable degree, or in addition to identical label topics are also closely related, or there is other reason why topics actually may be often confused with one another.