What is the difference between 早上好 and 早安?
As I understand both mean "Good morning". But what is the difference? Are there any occasions where one is used over another?

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In China, people use to say早上好. In Taiwan, people use to say早安

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Both these means "Good morning".
I seldom say"早上好", I say "早" or "早呀", it's more casual. It's a little formal when we say "早上好".
When I send a message on Wechat sometimes I will say "早安"。
People in Taiwan or Hong Kong like say "早安"。

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“早上好”和“早安”的意思和用法完全一样。

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Actually I think 早上好 can be used to greet anyone in the morning. But 早安 is a little formal, and usually used to greet old pelple.