How to overload or another solution for same logic function in C#

Hello,

I'm using below code to get some information from my com object.

As you can see first and second functions content same only input is different one of them is IScrNamedObject and the other is IScrBody.

It's easy to overload but it's not sufficient i think to duplicate same logic.

Is there any solution for that?

        public static int GetObjectSubstrLevel(simpackcomslvLib.IScrNamedObject obj)
        {
            int level = 0;
            while (true)
            {
                switch (obj.parent.category)
                {
                    case "Model":
                        return level;
                    case "Variant":
                        return level;
                    case "Substr":
                        level += 1;
                        obj = obj.parent;
                        continue;
                    default:
                        obj = obj.parent;
                        continue;
                }
            }
        }

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But  i have to declare this type of function so much for another input types like below;

        public static int GetObjectSubstrLevel(simpackcomslvLib.IScrBody obj)
        {
            int level = 0;
            while (true)
            {
                switch (obj.parent.category)
                {
                    case "Model":
                        return level;
                    case "Variant":
                        return level;
                    case "Substr":
                        level += 1;
                        obj = obj.parent;
                        continue;
                    default:
                        obj = obj.parent;
                        continue;
                }
            }
        }

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