Unsure how to translate urls with sort and t params

[ngirard]

I'm trying to get feeds for e.g.

https://www.reddit.com/r/Zettelkasten/top/?sort=top&t=week

the corresponding url for the official feed is

https://www.reddit.com/r/Zettelkasten/top/.rss?sort=top&t=week

so I tried to translate it to

https://reddit.0qz.fun/r/Zettelkasten/top.json?sort=top&t=week

which does bring me a feed, but its contents doesn't match the parameters.

What am I doing wrong ?