One example is the use of the preradical morpheme -ko- in the verbal tense paradigm. In the Lingala variant covered in the present Atlas, it is only used for the future. In Northwestern Lingala it is also used for the present, and this under the influence of early-twentieth century missionary language prescriptions.
Another example is the nominal class concord system. Again, under the influence of missionary-imposed corrections of the pidgin in the Northwest, this system was expanded there.