They'll still grow once they recover from the nute burn, but yeah it'll affect (affect? effect? ) depending on how much it got burned. As long as you get all the excess nutrients out though I wouldn't be too worried. Every time around you learn something new. With most nutrients though it's always best to start 1/4 - 1/2 strength and see how your plants react and up your feedings as needed.
The buds will still grow but unfortunately you are correct in that they have been stunted. Nute burn at four weeks of flower is just about the worst time for something bad to happen. Been there and done that. All you can do is learn and move on. Feed less on your next grow.