Giant RS920 Bent Fork

[Will]

I recently got in a little accident and bent the fork on my bike, and I'm being told the best thing to do is replace the fork. I need a little help from you guys when it comes to this, though. Do I need to find a fork from this exact make of bike, or can I find use a new fork that's different from the rest of the frame? Also, if I can do that, how do I know whether the new fork will be compatible with the rest of the frame? Sorry if none of this makes sense, I'm new to riding and I'm really disappointed about the bent fork ;( so I'm trying to solve it as soon as possible. Thanks for your help guys!

[Painkiller]

Pictures always help, you can go with new or used, brand does not matter. What matters is Threaded or threadless, headset size and tube length, especially when going with a used fork. You will also have to swap headsets.