Pretty much. It depends also on exactly how close it is to you too. It's a distinct "crack" but I guess a fire cracker is a good reference.
If you really want to know just find a big field with a ditch in it, lay down in said ditch, and have some one shoot over you. Yes, that is crazy. Yes, I'm a Marine. You can also hear it by shooting supersonic rounds through a can.
An RPG sounds like a cross between a giant Roman candle/bottle rocket. I've heard it from both sides and it's MUCH cooler sounding when it's out bound. Lmao.
everything sounds cooler when its outbound haha!