I think there are also various types of what people would describe as harlequin, some being dominant/codominantly genetically inheritable, some perhaps only polygenetically.

I believe that is where the confusion over inheritability arises.

I know I keep seeing snakes being described as harlequins that to me look similar in pattern type, but that is it. No melty sides, not enough black, colour wrong....etc.

In the same way a non-genetic very reduced pattern/banded could look like a type 2 woma, but isn't.