Grey Kingbird
Tyrannus dominicensis
The adult gray kingbird is an average-sized kingbird. It measures 23 cm (9.1 in) in length and weighs from 37 to 52 g (1.3 to 1.8 oz). The upperparts are gray, with brownish wings and tail, and the underparts are white with a gray tinge to the chest. The head has a concealed yellow crown stripe, and a dusky mask through the eyes. The dark bill is heavier than that of the related, slightly smaller, tropical kingbird. The sexes are similar, but young birds have rufous edges on the wing coverts, rump and tail.
ID text from Wikipedia, CC BY-SA 4.0

Loggerhead Kingbird
Tyrannus caudifasciatus
The loggerhead kingbird has a length of 24 to 26 cm (9.4 to 10.2 in), and is a large species of kingbird with a heavy bill. It is two-toned dark upper parts and lighter underparts. The head, apart from the throat, is black with an orange patch on the topmost part of the crown which is rarely seen. The upperparts are gray and the underparts are lighter in color. In most populations there is a grayish band at the end of the tail, although this can be white.
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: Grey Kingbird and Loggerhead Kingbird.