If 5950x was designed for 240W max power like 12900k, then it is likely that the optimizations AMD would have needed to implement in the silicon would have also

If 5950x was designed for 240W max power like 12900k, then it is likely that the optimizations AMD would have needed to implement in the silicon would have also provided some additional frequency headroom. It's all hypothetical though since all we can do is compare the chips that were actually produced.