The pitchers of "N. benstonei" also resemble those of "N. smilesii" from Indochina. Clarke suggests that "N. benstonei" may represent an evolutionary link between the "Nepenthes" taxa of Indochina and Peninsular Malaysia. "Nepenthes benstonei" also superficially resembles "N. macrovulgaris" from Borneo. It differs in producing multiple inflorescences, which are longer than those of "N. macrovulgaris" and bear one- or two-flowered partial peduncles, as opposed to exclusively two-flowered in the latter. The waxy coating of its leaves also separates these species. "Nepenthes benstonei" has also been compared to "N. albomarginata", although the presence of a white band below the peristome, which gives the latter its name, makes identification easy. Upper pitchers of "N. benstonei" could be confused with those of "N. mirabilis", although all other parts of the plant have little in common.