Im not an expert like king el, but what i noticed from looking at my legit kolibas is that they dont really have a distinct bottom line going across their body, nigerians have an apparent dark line. Your nigerians and my nigerians have a more robust head shape than a koliba's. Your nigerians are very sandy in color just like a koliba which is even harder to compare.
Here are two more pics. Currently living in my 150g sump as my tuegelsi in my grow out tank nip both their pectoral fins. It's easy to tell Koiliba from nigerian laps especially when they are stable. Koliba is actually part of a Guinea lap group which have different pattern and headshape comapare to Nigerian lap group.