Using Google to use the incomplete names you provided and get ideas on most common use of those names in the hobby, I see that both are jumbos and both are in the Cichlid-forum profiles with pictures. I also see several articles that talk about one or the other fish. Check it out for more information. :thumb:
All true: the addenda to the scientific names are collection points, no more, no less. In the Rift Lakes, it is often true that fishes of a given species, collected at different locations, can be very different one from another. Perhaps the most striking case of this is the genus Tropheus- there are over 100 distinct populations in Lake Tanganyika, but only a few (9 at present) described species. That said, fishes collected at different locales, especially adjacent ones, are not necessarily different in any biologically meaningful way. Even so, most serious keepers of these fishes do not mix specimens from different locales.
An example- several Tropheus moorii populations from the southwest corner of Lake Tanganyika. These represent only a small fraction of the Tropheus 'variants' in the lake.
The importer would tell you the collection point...it is not something you determine if it is unknown to the seller. You can look at the pics in the Cichlid-forum profiles and see if they are different enough in all their moods to clearly differentiate.
Why not buy fish that are sold under the full scientific name with collection point if it matters to you?