Here’s an example to illustrate this. A post from a pretty popular account with more than 7k followers. One screenshot shows the original page in the browser. I’m not logged in and can’t interact, but I can see all public and unlisted comments. There are a fair few, and it’s got lots of boosts and favs.
The other shows the comments I can see from my account: exactly zero. My server knows about 1 boost, no favs.