Hi,
the last image is most likely really L028.
the images before can be L73 or H.lunaorum L339
I think that L 136b looks otherwise.
I think that L04/L05/L028/L073 are just color variations of the same species.
L04/L05 - gray-white background color
L028 - yellow-brown background color
L073 - dark-brown to black color background
http://www.hypancistrus.eu/hypancistrus-l-136/
Milan