As said earlier having a civilian nuclear power program is an entirely different thing than being able to enrich uranium much less enrich it enough to become a bomb. One does not lead to the other.
It is a very safe bet that Saudi Arabia will not have their own enrichment plants and would be purchasing their low grade fissile U232 fuel from the US or Japan, France, etc. All the deal covers is clearing them to build power plants which will no doubt be bought from US companies and allowing them to research reactor designs and operations. The expertise and equipment needed to create nuclear weapons is far different than what is needed for civilian nuclear power.
FYI: The US did NOT aid Israel in their nuclear programs - France did. Per a quick search on the matter,
France aided Israel's nuclear program in the 1950s and 1960s—culminating in the Dimona reactor—to secure a vital Middle Eastern ally and counter Arab nationalism, particularly that of Egypt's Gamal Abdel Nasser. Additionally, both nations felt alienated by Anglo-American nuclear policies and shared a determination to guarantee their own national survival.
This alliance was solidified for several specific reasons:
The Suez Crisis (1956): During the crisis, the Soviet Union threatened nuclear strikes against Britain, France, and Israel if they did not withdraw from Egypt. This emphasized to both France and Israel their extreme vulnerability to nuclear-armed superpowers, incentivizing a clandestine partnership.
Intelligence and Arms Cooperation: France was the young Jewish state's primary arms supplier. In return, Israel provided France with highly valuable intelligence gathered from Jewish communities in Arab countries experiencing instability.
Shared Cultural and Geopolitical Ties: Both French leadership and Israeli officials (such as Shimon Peres) viewed the cooperation as a way to bolster a democratic, Western-aligned presence in an increasingly hostile neighborhood.
As even Trumpolini has repeatedly stated, the US has no problem with Iran having a civilian nuclear power program. It is their pursuit of military uses (bombs) that is the problem.