Is it a 302 or 301 redirection?

I am upgrading a little fat online platform, and the url structure has changed. The thing that concerns me most is whenever it is a 302 or 301 redirect

Previous url: /contact.html
New url: /contact

Previous url: /about_us
New url: /about-us

Server is the same, domain stays the same, redirects are just syntax sugar for some inconsistencies