according to Seidels L-Catfish book, "king tigers (Hypancistrus sp. L066) are a very variable species, in which individual specimens can differ slightly, not only in coloration but also in body form and the length of the fins." This seems this is the case with most Hypancistrus, even zebra plecos occasionally have squiggly lines. Until king tigers are officially scientifically described its hard to know what is a king tiger. It may be that a number of the other L-numbers are also found to be just regional variants or sports of a king tiger. For example zebra plecos include L046, L098, and L173.
Based on what I've seen some "king tigers" have clearly defined beautiful patterning and others are more blurry. The width of the pale banding also varies from very thin giving them a dark look to quite broad making them look a lot lighter. A few have a yellowish background colour, just as some chocolate zebras also have an almost white base colour. You also get the odd 'sport' with stunning patterning. Theres a lot of variability out there so just go for one that you like the look of. These three fish were all bought together as small juveniles. They may also be from the same parents.