Kipp shared a little more with us, and I’m grateful that he did:

“There are two species of manroot you’re likely to encounter in the Bay Area: Marah fabaceus and Marah oreganus. M. fabaceus is called California Manroot and grows more or less throughout the state. Marah oreganus is called Coast Manroot and grows nearer the coast from Santa Cruz County northward. So, right off the bat, M. macrocarpus is ruled out - it ranges only as far north as Santa Barbara (or so).

As for identifying your particular photos:

The top image in your post was taken in the hills above Cupertino where both species grow. What distinguishes M. oreganus is the maple-like, rough leaves. M. fabaceus leaves have very straight edges on their lobes and the leaves are usually smoothish looking (from a distance that is - up close they have minute whiskery bumps).

The bottom image was taken in the East Bay. There is an isolated population of M. oreganus in the hills above Berkeley and Oakland - associated with the relict Redwood forests there - but otherwise East Bay means M. fabaceus as no other species grows in that area. As mentioned above, the leaves in the lower image are straight-edged and smoothish - a very technical term ;-). The fruit is also helpful as M. oreganus fruit is usually striped with dark green, has sparse spikes and tapers to a point - the fruit in your picture is the round, untapered and densely spiked form typical of M. fabaceus.

Seeds, when it comes to these 2 species, are the most diagnostic: M. oreganus has unique flattened seeds shaped kind of like a hockey puck. M. fabaceus has, like most of the other Marah species, smoother, bullet-shaped seeds.

Marah are extremely variable and where the ranges overlap they freely interbreed. Even individual vines will have very multiple different leaf shapes. This can make identification difficult for individual plants - but you happen to have taken pictures in locations, and of distinct-enough specimens, that the ID is fairly easy in this case.