Is an FEI number the same as an EIN?

Could you please clarify for me, is an FEI number synonymous with an EIN, or are they distinct identifiers used for different purposes within the realm of finance and business? I'm seeking a definitive answer to ensure my understanding is accurate and that I'm not mixing up two separate entities. Understanding the distinction, if any, is crucial for accurate reporting and compliance within my field of work. Thank you for your assistance in clarifying this matter.