[T]ransfictional statements about models should be read as prefixed with a clause stating what the relevant respects of the comparison are, and this allows us to rephrase comparative sentences as comparisons between properties rather than objects…Hence, truth conditions for transfictional statements (in the context of scientific modelling) come down to truth conditions for comparative statements between properties, which are unproblematic in the current context (that is, the problems that attach to them have nothing to do with issues surrounding fictional discourse).
Source: wiktionary