Savannah Sparrow
Passerculus sandwichensis
The Savannah sparrow has a typically sparrow-like dark-streaked brown back, and whitish underparts with brown or blackish breast and flank streaking. It has whitish crown and supercilium stripes, sometimes with some yellow (more often near the beak). The cheeks are brown and the throat white. The flight feathers are blackish-brown with light brown or white border. The eyes are dark. The feet and legs are horn-colored, as is the lower part of the bill, with the upper part being dark grey.
ID text from Wikipedia, CC BY-SA 4.0

Swamp Sparrow
Melospiza georgiana
Measurements: Length: 4.7–5.9 in (12–15 cm) Weight: 0.5–0.8 oz (15–23 g) Wingspan: 7.1–7.5 in (18–19 cm) Adults have streaked rusty, buff and black upperparts with an unstreaked gray breast, light belly and a white throat. The wings are strikingly rusty. Most males and a few females have rust-colored caps. Their face is gray with a dark line through the eye. They have a short bill and fairly long legs. Immature birds and winter adults usually have two brown crown stripes and much of the gray is replaced with buff. Voice: The song of the swamp sparrow is a monotone trill, slower than that of the chipping sparrow. A male can have a repertoire of several different trills. The common call note is a loud chip reminiscent of a phoebe.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Savannah Sparrow and Swamp Sparrow.