Actually there is, you can compare the situation and the history. Any 5-4 pp is dramatically less effective than a 4-3 pp, and when it is in OT, there is no subsequent play during which a goal can be answered. Then if a key penalty occurs the other way during the time in which the team should have been on the PP, which leads to an OT goal against, you have direct proof that that call affected the outcome of the game.
Others may have said that, but anyone who says that is wrong. A non-deliberate act, no matter how egregious, is effectively luck. A deliberate act is not, and is patently improper refereeing.