So all dragons regardless of body style (grey vs red while not actually hues are body styles) display that ShrunkID. These IDs can only be changed if other ones are available. In this case, no.
I figured the serpentine dragon would have its own unique ID but in this case, it seems it does not, at least I was not able to find it when searching.
If anyone with a production account could trade one I would be curious what the shunk ID looks like if it even has one. If not then it defaults to the dragon frame.
Will mark as investigating for now but otherwise does not appear to be a bug as it's out of control.