Darvin Ham's situation is quite similar to the temporary coach of the Boston Celtics, but the latter is much more difficult because he need to duplicate Ime Udoka's performance or better than that while Darvin Ham's situation is how to get these team full of point guard to work as one while thinking not to overload AD's shoulder so that he could play much longer. There's a chance but coach Ham need to find that key.
I view it the other way around. I see Ham has the more difficult job against Joe Mazzulla. The Celtics is already established and there is not much of changes. He was with them for 3 years thus the players and asst coaches know him. He is already familiar with the plays of Udoka as well. Unless he wants to change and move away from the plays of Udoka, he will have a very comfortable job.
On the other hand, the Laker's seems still to find what direction they are going to. They are amassing PG's as you said but no reliable role players coming from the bench. They will be solely relying on their stars AD and Lebron, and WB (if he can put his game together). Darvin Ham has his work cut out for him.
You certainly got a point that Darvin Ham's situation is much more difficult than Mazzulla's, but I've read somewhere that the latter is not that always active in his past role that's why the Celtics is not that sure that they are in good hands, don't know if it's true but in case it's true, the franchise and its players are in a dilemma.
I'm not sure who's job is more difficult though, but the most important thing is that they should do their job on this delicate situation, and see if they are really task to do it or not.
Ham is on the first year, inheriting a franchise that is being plague (and they are not used to it), by losing numbers so he has to turn it around.
While Mazzulla, Celtics is on winning form, in the finals last year, but with the recent controversies, he need to focus his player more on the game and not the noise outside.