Does not the lower limb of the Main Spring serve as the Sear Spring on the 2nd gun pictured? I think the key word here is the first type has a separate sear spring while the 2nd type uses one leg of the mainspring.
Both though Have Sear Springs, the sear would not engage without a spring.

Lefevers with in-frame ejectors use the upper limb of the < shaped mainspring to power the ejectors. It would be totally incorrect to say they have no ejector springs.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra