imo that is still different. Higher ups planned it in advance, there were measures taken. His "death" was not in the initial equation but Seeley and King still had time to prepair. Lobdell was announced one month before the issue released and the solicitations keep changing again and again. Percy left, the guy that introduces the change in NW. That's as if King wrote Nw#30 and then Seeley wrote Grayson alone (or vice verse).
Yes, Grayson did something new. But if we look at the change then it's just Superhero to Undercover Spy.
For this Amnesia arc it's name change, memory erasure, no superhero identity, changed appearance. And we do know how it ends. The same way Bruce' amnesia did and the same way Grayson ended. With things forgotten or erased and no effect whatsoever.
Problem is I will to 80% not enjoy the journey.
It's neither backed by a liked writer nor by a newcomer. Just a writer who took two runs of a character to make the third run universally accepted.
Yeah, maybe Lobdell learned, maybe he can introduce or bring back characters that have impact on Dick like Artemis and Bizarro had on Jason but we also know that he is appearently only a guest writer(?), so for now it looks as if he does not even have the time and again, he does not even get to introduce Amnesia!Dick.