Pacific Wren
Troglodytes pacificus
Rufous brown above, richly colored below, barred with darker brown and dusky, even on wings and tail. The bill is dark brown, the legs pale brown. Young birds are less distinctly barred.
ID text from Wikipedia, CC BY-SA 4.0

Winter Wren
Troglodytes hiemalis
Small tail is often cocked above its back, and short neck gives the appearance of a small brown ball. Rufous brown above, grayer below, barred with darker brown and gray, even on wings and tail. The bill is dark brown, and the legs are pale brown. Young birds are less distinctly barred. Most are identifiable by the pale "eyebrows" over their eyes. Measurements: Length: 8–12 cm (3.1–4.7 in) Weight: 8–12 g (0.28–0.42 oz) Wingspan: 12–16 cm (4.7–6.3 in)
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: Pacific Wren and Winter Wren.