Yet, in textbook discussions and various articles about conjoint analysis, there are examples where these values have different ranges and can even have negative values. Technically, conjoint weights are intervally scaled, not ratio scaled. Thus, differences in conjoint weights are meaningful but ratios are not. With intervally scaled data, any positive linear transformation of the raw conjoint weights is permissible.
Relative differences are unaffected by such positive linear transformations.
I've chosen to scale the raw conjoint weights into the interval 0 to 100 for ease of interpretation. They're just different approaches to reporting the same underlying raw conjoint weights.