[1] https://en.wikipedia.org/wiki/Casualties_of_the_Russo-Ukrain...
The expectation is that there are at a minimum 15/20% dead under the bombed and decimated buildings. It could well be much, much higher, even double, or triple is not infeasible, given the large scale untargeted bombing, population dispersement and recognised IDF tactics that don't allow for groups to even consider searching and rescue operations in most cases but leave possible survivors buried under the rubble to die slowly and horribly.
The current numbers are just not even close to verifiable given the circumstances, but are statistically clearly far worse in terms of civilians on all measures.
Earlier it has been said that based on previous reporting from previous incidents we can roughly trust the total numbers Hamas release evem if they are obviously wrong in that they claim every death to be an innocent civilian.
The current geopolitical outcome of Egypt accepting large numbers of Palestinian is that Israel does what it is doing now to Palestine, to Egypt at some point in the future.
E.g. you might compare it to ukrainian battles that took place in cities, but you wouldn't compare it to ukrainian battles that took place in the middle of nowhere where no civilians were. https://en.wikipedia.org/wiki/Civilian_casualty_ratio has some things to compare against. Part of the problem is it is often hard to identify who is a civilian, and often different battles will categorize them differently. For example, in the iraq war us was accused of significantly undercounting civilian casualties. All this makes it hard to do direct comparisons.
Numbers from:
