The main difference is that an anticipated Sunday Mass for “normal” Sundays is to be celebrated in the evening, while the Easter Vigil is specifically indicated to be celebrated at night.
That may sound like hair-splitting in English but in church-ese, the two periods are notably different. “Evening” is defined as the end of the daytime hours, i.e. twilight. More specifically, “evening” for anticipated Mass times is whenever Vespers can be celebrated, which is “when the day is far spent and evening draws near.” This is not precisely indicated in terms of civil time, which the Church does not generally use, so most bishops have set this at 4 PM, according to whatever civil time is in use in the area.
The Easter Vigil, however is celebrated at night, which is distinct from evening and when Compline is typically celebrated. Compline is said before bedtime, when most reasonable people go to sleep. In church-ese, this means dark, or at the end of nautical twilight.