um yea, phone plans are different, and have been for a number of years. When I first started streaming with a mifi in 2020, I had to plan how much data I was using and get a plan to cover that. When I went to using a phone as a hotspot, we were on an "unlimited" plan (which I think most are now).
Under most unlimited plans, you get full bandwidth until you reach a cap point. Then they'll throttle you down, especially during certain hours.
But, if one is using their phone for web browsing, I would expect it's the same amount of data to do the same browsing from a laptop using the hotspot feature.