The newer version is better(more rigid) than the original stock that came with the RAR 223 I bought 5-6 or more years ago. I'd go with it and see how it shoots.
I bought my 223 for a spare/beater rifle and it has performed well for that. The thing shoots great. Way better than it should for $300 out the door. Opened the barrel channel a bit and went with a lighter trigger spring.
