Oak Titmouse
Baeolophus inornatus
Voice: The song of the oak titmouse is a series of repeated phrases of two or three notes with the last note of lower pitch; usually, three to seven phrases are grouped together. Vocal behavior differs between males and females for oak titmouse.
ID text from Wikipedia, CC BY-SA 4.0

Tufted Titmouse
Baeolophus bicolor
Measurements: Length: 14–16 cm (5.5–6.3 in) Weight: 18–26 g (0.63–0.92 oz) Wingspan: 20–26 cm (7.9–10.2 in) A small bird, the tufted titmouse has a white front and gray upper body outlined with rust-colored flanks. Other characteristics include its black forehead and the tufted gray crest on its head. In juveniles, the black forehead is greatly diminished such that it may be confused with the oak titmouse, although their ranges do not overlap. Males tend to be larger than females.
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: Oak Titmouse and Tufted Titmouse.