You can use any original Apple USB-C charger available either for Mac or iPad. Furthermore, you can use many 3rd party USB-C chargers. Technically most will just work, but you should use only good quality chargers from solid brands like Anker, Ugreen and so on. If the charger was 10 bucks off Amazon it's probably not a good idea to risk the Mac and these can be a hazard to your life as well if they are missing safety features.
Around 100W is the maximum the 14" models can charge with for fast charging. Around 40-60W provide plenty of power if you don't need fast charging, hence the standard charger Apple gives you is a 67W one.
Do not attempt to use Apple chargers that do not have a USB-C port.
I currently use Anker Nano chargers as they are literally less than half the size of Apple chargers making commute with a charger in the backpack simpler than having to carry that entire Apple charger brick with me every day. If you end up buying another one I suggest you skip Apples chargers. They work fine but provide no inherent benefit over other reputable brands. (Other manufacturers also have tiny chargers, I just happened to try Anker first.)