When it comes to "Israel", the American "Patriot" system is available, and Washington sends deliveries from it.
The Kingdom of Saudi Arabia receives minimal amounts of American attention when it comes to security.
Washington may change some of its measures in favor of Israel, but it does not do so with its other allies in the region.
Knowing that the investments, facilities and deals that Saudi Arabia offers with Washington are not guaranteed by Tel Aviv. Instead, more than that, "Israel" receives military, security, political and other support from Washington.