😊. They are different. Cannot be used in the same situation. If you're going to bed, I can say 晚安 to you， 晚安= have a good dream. If we chat or meet at night, I can say 晚上好. I hope it helps you.

Thanks so much

晚上好 可以在晚上见面的时候打招呼用。 晚安 用在去睡觉前，说完大家就去睡觉了。