Has a World Cup game ever ended 4-3?
Yes. World Cup has seen a final score of 4-3 3 times. It first happened on June 17, 1970, when Italy beat Germany, and most recently on June 30, 2018, when France beat Argentina.
That makes 4-3 the 21st most common final score out of 34 that have ever occurred in World Cup. One point away, 5-3 has happened 1 times and 4-4 has happened 2 times. At one point the score disappeared for 32 years, between 1986 and 2018.