Neither one is strictly defined, so different people use them differently. Commonly, many people use “bi” to mean “attracted to multiple genders” (which still means they may not be attracted to trans, genderfluid, etc) vs “pan” meaning “gender doesn’t factor into it at all”.
Some people use both interchangeably. Some people may use one, but not know about the other.
When it comes to specific people using those words, you need to ask them what they mean by them.
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