While it's interesting...the difference is the mode of inheritance. It has been scientifically proven the coloring in partis and biewers is the result of the recessive piebald gene. Both parents must offer the gene for it to be expressed.
In panda shepherds...the mode is a single dominate.
Phenom Shepherds - Genetic Panda Info
My understanding of the 40 some thousand genes that comprise a dog's "make up"...the most research and known information is in regards to coat color.
There is a genetic marker available for the piebald gene so yes... whether a dog was a "carrier" or "splitter" could be determined via DNA.