Of course they don't, it is simply not possible, outside of some awful models maybe. For instance in the current gen, iPhone 15 Pro with 3300 mAh gets 86 score at GSMArena, and S23 Ultra with 5000 mAh gets 126. A dramatic difference. S23 non-plus, which is a better opponent to 15 Pro as they are the same size, has 3900 mAh and scores 101 at that site. So all is quite proportional to the battery size. Or we can throw in for comparison newest Sony 5 5, with the same 6.1" form factor and 5000 mAh battery (shame on all other vendors, not fitting such batteries in flagship phones), it has a score of 130!

So, anyway, iPhone has a just a little bit better optimizations in some specific usage modes and that difference is mostly long gone. Today if we see 3300 battery in a phone it will definitely have a shitty autonomy.