There is an image here of what a geniune Pop Lloyd looks like:
https://sports.ha.com/itm/baseball/1...Results-012417
I have spoken to Steve Grad and he showed me some Beckett exemplers that have never been shared publicly, but they all seem to resemble this example (including the the "L"s in Lloyd not being connected. The one I owned and the ones you show have them connected. So the signature do look different. That being said, his signature could have (easily) changed later in life.
I know, you want to do everything possible to convince the signature is good (trust me, I have been there). My collection has plateaued for the most part for this very reason as I will no longer spend over $1,000 on an autograph unless it is on some official document I don't feel 100% comfortable with.