I believe yes. I recently bought a scale from Hinderer for my Gen 2 3" and there was no problem and they didn't inquire what Gen I had.
You can buy direct from Hinderer, or from one of their dealers. Not all colors and materials will be available at all times. I believe they all charge the same.
The exchange is good place to get a price break or try to find the harder to get scales.
Congratulations on your new knife. I love the 3". I have probably owned 6-8 of them over the years, mostly non-flippers