Having two cover letters provides you with the opportunity to customise and tailor your cover letter to fit specific job applications.
Each job application requires a unique set of skills and qualifications, and having two cover letters allows you to highlight different strengths and experiences in each letter. This can improve your chances of getting noticed by potential employers and even further improve your chances of landing your desired job.
Also, having an extra cover letter can be useful in case you need to apply for multiple jobs simultaneously. It provides you with a versatile tool that can be easily adapted to fit different job applications.