Bluish-grey Saltator
Saltator coerulescens
On average, the bluish-grey saltator is 20 cm long and weighs 52 g. The plumage depends on age and subspecies, but in general this bird has grey or greyish-olive upperparts, a white stripe over the eye, a narrow white throat, a grey breast and a buff or cinnamon belly. The common call is a long-drawn upward slur, ch'wheeet or ch'kweeee, sometimes with a more elaborate beginning, as hi'whee chu weeeeh. The song is a warble, usually fairly short, varying from nasal to mellow.
ID text from Wikipedia, CC BY-SA 4.0

Olive-grey Saltator
Saltator olivascens
The olive-grey saltator has a thick, black bill that is slightly hooked at the end, with white supercilliaries (giving it a distinct white "eyebrow"), and a thin white crescent under its eye. Distinct black malar stripes frame either side of a white throat. Its underside is a light grey with some buffy coloration towards its flanks and undertail coverts. Voice: Described as having "a 'stuttering song' with rather harsh-sounding downslurred notes", they alternate high and low pitched notes to form a short but sweet melody that can be heard throughout the year. Both males and females sing, at times duetting in "a fast series of repeated rising whit notes, a series of overslurred low-pitched chup notes or loosely repeated high-pitched tseet notes.
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: Bluish-grey Saltator and Olive-grey Saltator.