BX8071513900KS processor for Dell precision 3660 ?

13900K definitely compatible
13900KS should too, but no user benchmark evidence yet.

PS
“Overall, the Core i9 13900KS is a very niche product, and likely only interesting for those looking for the absolute best-of-the-best Intel Core, and don’t mind paying a premium for minimal performance gains. It is also likely better binned for things like overclocking if that is of interest to you, but for workstation purposes, generally recommend avoiding overclocking as the gains are typically not worth the stability tradeoff. On the whole, most will want to simply stick with the Core i9 13900K and pocket the cost savings.”