Here, found it:
$ ls
Español Español Français Français
$ ls | hexdump -C
00000000 45 73 70 61 6e cc 83 6f 6c 0a 45 73 70 61 c3 b1 |Espan..ol.Espa..|
00000010 6f 6c 0a 46 72 61 6e 63 cc a7 61 69 73 0a 46 72 |ol.Franc..ais.Fr|
00000020 61 6e c3 a7 61 69 73 0a |an..ais.|
00000028
The first one (6e cc 83) is NFD which is used by mac, the second one (c3 b1) is NFC which is used by everyone else.