Over the week end, I watched a video of Taggart, a Scottish detective.
There were scenes in a sausage factory where long, round casings that appeared to be 2”+ were filled with the sausage mixture. They were boiled and then hung up. After that was accomplished, another person placed the rounded balls of haggis in the water to boil and later removed and suspended from the same racks as the sausage.
The haggis was clearly seen to be different from the sausage
On the outside yes, but that is basically just a cosmetic difference..................