Can I create multiple SendGrid blocks for different email templates using the same API key?


I’m using Airtable as an Applicant Tracking System (far more advanced than the template they give us to start out with) and as part of that I have to send Rejection emails or next step emails. I want to create a sendgird block for each email type so I don’t have to keep changing the subject and content over and over again and I was wondering if I could use the same SendGrid API key to do that or am I supposed to request another API key, one for each block.