Identifying common - replacing Diva 3-way dimmer with Caseta

I am attempting to install a Caseta 3-way dimmer solution in place of an existing Diva 3-way dimmer. I am having trouble identifying the common wire to "tag". In my box, I see the following connected (between the wires on the Diva and the wires in the box)Diva wallred redgreen copperblack whitered/white blackhttps://imgur.com/a/2zV0IkDIn the other switch, there was a leviton 3-way wired much more straightforwardly as:white to black screw (common)black & red to travelerhttps://i.imgur.com/obAPtnP.jpegWhat I can't figure out here is what is the "common" wire to tag? All the documentation says to the "different-colored screw" but I'm not sure what that is in the case of the Diva, which has no screws but only different-colored cables. copper to green screw (ground)

okay, the formatting on this went all wrong. I apparently can't add a line break. Anyway, this is the wiring in the box, listed as from the diva to the wall box.

1. red to red
2. green to copper
3. black to white
4. red/white to black

https://imgur.com/a/2zV0IkD

In the other switch, there was a leviton 3-way wired much more straightforwardly (green to ground, white to common, red/black to travelers): https://i.imgur.com/obAPtnP.jpeg

What I can't figure out here is what is the "common" wire to tag? All the documentation says is the "different-colored screw" but I'm not sure what that is in the case of the Diva, which has no screws but only different-colored cables.

Can't edit unfortunately. After looking this, my best guess is that the black wire on the Diva is common, and red/white and red are travelers?

ugh one more correction: it is, of course, black to black, not black to white. The black appears to have some white paint on it - is this a common practice for tagging common/hot wires?

In summary, my hypothesis is that we have, from the wall: black (hot) into Diva black (common), Diva red and red/white travelers out to 2nd switch, where we have black & red as travelers and then white as the common for return? Does that sound correct?

Got this all resolved and installed.