As you can see from the definition you provided for [dbo].[ConfigData], both `Value` and `ValueInUse` are defined as `SQL_VARIANT` data types.  The error message you are receiving is:

> Msg 257, Level 16, State 3, Procedure usp_SysConfigReport1, Line 19
> Implicit conversion from data type sql_variant to int is not allowed.
> Use the CONVERT function to run this query.

So `Value` and `ValueInUse` are `SQL_VARIANT` (as also are the derived values for `OlderValue`, `OlderValueInUse`, `RecentValue`, and `RecentValueInUse`) but you want to use them as `INT`.

The error message is saying that you need to change the `SQL_VARIANT` into INT by using the `CONVERT` function.  An example of selecting a `SQL_VARIANT` and turning it into an `INT`. 

    SELECT CONVERT (int, Value) FROM [dbo].[ConfigData]

The `CONVERT` changes the datatype (if possible) from `SQL_VARIANT` to `INT`.

Just make sure to `CONVERT` to the proper data type and all should be well.