I have never kept Petrochromis sp. "Texas Red Fin" Ubwari but judging from the many photos I have seen, this Petrochromis and P. sp. "Texsas Red Fin" Longola look similar but the shape of their head and snout is rather different and thus maybe they shouldn't be included in the same species.
The Texas petro from Ubwari has a shorter snout, like P. polyodon
from the South of the lake or P. sp. "Texas" Bulu Point, while the Texas petro from Longola has a more elongated snout which remind me that of P. machrognathus
or, even more, that of P. sp. "Macrognathus Rainbow" from the Kipili area.
Obviously this is only an idea which should be confirmed checking the morphometric data of many specimens!
Here is a pic of the head P. sp. "Texas" Bulu Point
and this is a Longola Texas Petrochromis, judge by yourself
Hope to read from someone else!
Cheers, Paolo Salvagiani