Enchi looks nothing like BlkPastel
Spider looks nothing like Blackhead looks nothing like Champagne looks nothing like Cypress
Phantom looks nothing like Bamboo
Just because things have a minor difference (or not so minor, as some of my above illustrate) in appearance from one another does not, by default, mean they are not alleles of the same gene
Given the remarkably similar appearance between Striker and Zebra, I do not think it is an unreasonable question to ask