Yes, the markings, I understand it differ on the trailing outer forewing hind margin near the tornus. U. pulchelloides typically has 5 red marks along the hind margin, whereas U. lotrix lacks the fifth outer red mark, having only 4.
U. lotrix and U. pulchelloides both have 5 red spots along the costa. The number differs only along the forewing hind-margin, the possible 5th (U. pulchelloides) at the tornus, see for example original drawing of U. lotrix by Pieter Cramer at Figure E (lower left corner) of https://www.biodiversitylibrary.org/item/95175#page/52/mode/1up
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