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ServerCore/Comparer/KeyComparer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+
+namespace ServerCore;
+
+public static class KeyComparer
+{
+    public static List<TKey> getKeysOnlyInSecond<TKey, TValue>(Dictionary<TKey, TValue> first, Dictionary<TKey, TValue> second)
+        where TKey : notnull
+        where TValue : notnull
+    {
+        return second.Keys.Except(first.Keys).ToList();
+    }
+
+    public static List<TKey> getKeysOnlyInSecond<TKey>(List<TKey> first, List<TKey> second)
+        where TKey : notnull
+    {
+        return second.Except(first).ToList();
+    }
+}