Some gears have a bit rounded profile on the tooth, and some are sharp. It's probably fine. But you need to find out what damaged that ring gear, unless you didn't replace that yet.
The sun gear looks to be a little rounded over, but it's really hard to say unless you compare it with a new gear. Are you putting lube on the ring and pinion? What kinda diff lube are you using? Get some Mobil1 synthetic grease for the ring and pinion. It's the red stuff, and is safe for plastic.
Of the gears. Any you can share might shed some light on what's going on. Take a pic of the diff in the housing meshed with the pinion looking straight down on it.
A normal diff won't make much noise at all. If you spin the axles in opposite directions, it should feel smooth. If it does, then it's likely your ring and pinion mesh. Pics would help.
It could be. Look at all the gears very closely and look for wear. Tip: sometimes if you take a pic of the gears, you can zoom into the pic and see wear better. Look for shiney spots to show you where there may be problems.
Not familiar with the Baja Rey diffs, but a lot of the diffs out there are very similar. Are there shims in the diffs that you install behind any of the gears? If so, maybe you need to use thinner ones. Sometimes you need to shim the large outer bevel gears to get things to mate up properly. Let...