Closest hex to #ccaa00 is #ca0

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#
#ca0

ccaa00

ccaa00

contains ca

0ca 1ca 2ca 3ca 4ca 5ca 6ca 7ca 8ca 9ca aca bca ca0 ca1 ca2 ca3 ca4 ca5 ca6 ca7 ca8 ca9 caa cab cac cad cae caf cca dca eca fca

contains a0

0a0 1a0 2a0 3a0 4a0 5a0 6a0 7a0 8a0 9a0 a00 a01 a02 a03 a04 a05 a06 a07 a08 a09 a0a a0b a0c a0d a0e a0f aa0 ba0 ca0 da0 ea0 fa0

contains c0

0c0 1c0 2c0 3c0 4c0 5c0 6c0 7c0 8c0 9c0 ac0 bc0 c00 c01 c02 c03 c04 c05 c06 c07 c08 c09 c0a c0b c0c c0d c0e c0f cc0 dc0 ec0 fc0