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Their meanings are somewhat different. In a few situations, they are interchangeable, but there are many others where you can only use one and not the other. The key difference is that 呗 is much more assertive, even rhetorical, whereas 吧 can be used to express doubt or uncertainty as well. For completeness I'll cover them all. Definitions taken from ...
Always use 吧. This is standard/proper Mandarin. 唄 is used in regional dialects. 口 mouth radical indicates the character is meaningless and used purely phonetically. The pronunciation is indicated by the character on the right 贝 (bèi) and 巴 (bā).
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