Assuming you don't have control of the modules themselves, this is a valid case for symbolic refs:

$ref_to_desired_hash = do { no strict "refs"; \%{"MyModule::$cc::Hash"
+} };
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or the symbol table lookup equivalent:

$ref_to_desired_hash = \%{$MyModule::{$cc."::"}{Hash}};
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If you do have control of the modules, have each one export the hash to a single name, and just eval "use MyModule::$cc".