Move CloneAppearance to Shared (#35017)

* Move CloneAppearance

- Move CloneAppearance from HumanoidAppearanceSystem
to SharedHumanoidAppearanceSystem

* CR - Fix the sins of the past

Content.Shared/Humanoid/SharedHumanoidAppearanceSystem.cs

@@ -132,6 +132,34 @@ public abstract class SharedHumanoidAppearanceSystem : EntitySystem
             Dirty(uid, humanoid);
     }
 
+    /// <summary>
+    ///     Clones a humanoid's appearance to a target mob, provided they both have humanoid components.
+    /// </summary>
+    /// <param name="source">Source entity to fetch the original appearance from.</param>
+    /// <param name="target">Target entity to apply the source entity's appearance to.</param>
+    /// <param name="sourceHumanoid">Source entity's humanoid component.</param>
+    /// <param name="targetHumanoid">Target entity's humanoid component.</param>
+    public void CloneAppearance(EntityUid source, EntityUid target, HumanoidAppearanceComponent? sourceHumanoid = null,
+        HumanoidAppearanceComponent? targetHumanoid = null)
+    {
+        if (!Resolve(source, ref sourceHumanoid) || !Resolve(target, ref targetHumanoid))
+            return;
+
+        targetHumanoid.Species = sourceHumanoid.Species;
+        targetHumanoid.SkinColor = sourceHumanoid.SkinColor;
+        targetHumanoid.EyeColor = sourceHumanoid.EyeColor;
+        targetHumanoid.Age = sourceHumanoid.Age;
+        SetSex(target, sourceHumanoid.Sex, false, targetHumanoid);
+        targetHumanoid.CustomBaseLayers = new(sourceHumanoid.CustomBaseLayers);
+        targetHumanoid.MarkingSet = new(sourceHumanoid.MarkingSet);
+
+        targetHumanoid.Gender = sourceHumanoid.Gender;
+        if (TryComp<GrammarComponent>(target, out var grammar))
+            grammar.Gender = sourceHumanoid.Gender;
+
+        Dirty(target, targetHumanoid);
+    }
+
     /// <summary>
     ///     Sets the visibility for multiple layers at once on a humanoid's sprite.
     /// </summary>