For example, ἐν or Ἐν are the same, but should be distinguished from ἕν/Ἓν. I've tried utf8_bin which seems to be the closest, but is also case sensitive.
mysql> select 'ἐν' = 'Ἐν' collate utf8mb4_0900_as_ci;
+----------------------------------------------+
| 'ἐν' = 'Ἐν' collate utf8mb4_0900_as_ci |
+----------------------------------------------+
| 1 |
+----------------------------------------------+
mysql> select 'ἐν' = 'ἕν' collate utf8mb4_0900_as_ci;
+----------------------------------------------+
| 'ἐν' = 'ἕν' collate utf8mb4_0900_as_ci |
+----------------------------------------------+
| 0 |
+----------------------------------------------+
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