Closest hex to #66bb33 is #6b3

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#6b3

66bb33

66bb33

contains 6b

06b 16b 26b 36b 46b 56b 66b 6b0 6b1 6b2 6b3 6b4 6b5 6b6 6b7 6b8 6b9 6ba 6bb 6bc 6bd 6be 6bf 76b 86b 96b a6b b6b c6b d6b e6b f6b

contains b3

0b3 1b3 2b3 3b3 4b3 5b3 6b3 7b3 8b3 9b3 ab3 b30 b31 b32 b33 b34 b35 b36 b37 b38 b39 b3a b3b b3c b3d b3e b3f bb3 cb3 db3 eb3 fb3

contains 63

063 163 263 363 463 563 630 631 632 633 634 635 636 637 638 639 63a 63b 63c 63d 63e 63f 663 763 863 963 a63 b63 c63 d63 e63 f63