Certainly on the day you can have 100% overlapping LLs. It seems like the overlapping rules get lifted along with the tiers and parks as soon as you tap in.
It’s also surprising to me how some of these bloggers appear not to have realised that you can get far more times than the ones you might initially be offered. If she was doing this in the parks she missed a trick. There again it was the same for FP+. - people just looked at the times that popped up and thought those half dozen times were all that they could choose.