I think all of the Southern states have their own version of the Southern accent. They are similar enough that most people that don’t live here would not notice but I can tell them apart. Georgia, Alabama, and Mississippi all have a slight difference but Tennessee and Texas sound similar to me.
I’m from North Florida aka the heart of Dixie. I’ve lived in Georgia, Arkansas and North Carolina. Yes, there are some differences - for example Tidewater Virginia sounds different from Appalachian which is different from Cajun and all of those are a bit different from what I’d simply call a standard Southern accent. That said......differences between Georgia and South Carolina or Alabama and Mississippi? Not really.
Similar deal in the Midwest. I can hear rural Minnesota and maybe slightly Wisconsin. But Iowa from Illinois or Ohio from Indiana? Not really.