Anthony, no Sir. 300 PRC case is slightly shorter at 2.58 inches than the Win. Mag., it offers about five percent more capacity. The . 300 PRC has a long neck and added head height, which allow it to be loaded with high ballistic-coefficient bullets. They are 2 different cartridges and not interchangeable. The 300 Win Mag is belted and the 300 PRC is not as pictured here : (https://2poqx8tjzgi65olp24je4x4n-wpengine.netdna-ssl.com/wp-content/uploads/2020/08/300-PRC-300-Norma-Mag-300-Win-Mag.jpg) Cheers and stay safe!

300 PRC and.300 Win Mag factory loads generally have similar muzzle velocities, but the 300 PRC shoots a heavier bullet with a higher BC. Therefore, 300 PRC has a slightly flatter trajectory, a little more retained energy, less wind drift, and somewhat more recoil than the 300 Win Mag.
Good article comparing the 2 here
https://thebiggamehuntingblog.com/300-prc/