It's not that complicated
In general:
hypo = ghost = orange ghost = bell line orange ghost, compatible lines of a recessive hypomelanistic trait.
When the original WC animals were imported, they were given a name. One might have been a little more orange in coloration, and was therefore named "orange ghost". When bred to hypos of another line, it turns out that they are the same morph. The polygenetic traits of coloration cause more variation in coloration than the existence of the ghost phenotype in an individual.
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