Leon, I never played it with the D shape and Dm shape. We always played it like I tabbed it. It's E6 to A7 if you want to name the chord fragments used.
"Theory only seems like rocket science when you don't know it. Once you understand it, it's more like plumbing!"~John McGann
There is no "A" anywhere in Lynyrd Skynyrd.
It's S Q U I E R! Not Squire. Look at your guitar!