High Sierra Topix

Hi there, asking for a friend. Darwin Col? or is it Lamarck Col? Cross country route to JMT from Lake Sabrina. How difficult is it?

Darwin Col(12800ft), Lamarck Col's(12960ft) approach is from North
Lake.
Both are class 2, Darwin having more loose scree in a gully that
heads up the eastern side from Blue Heaven Lake.

Never been over them, but both Echo Col or Wallace Col go from Lake Sabrina over to the JMT. I think both are considered class 2-3, from what I've read extremely rough, and I'm just guessing here but I think they may be more winter than summer routes.