def custom_config_updated_params(changes, vers1):
    """Generates data frame of updated parameters in custom configuration.

    Updated parameters have changed from the base default version.

    Parameters
    ---------------
    changes : pandas.DataFrame

    vers1 : str

    Returns
    ---------------
    pandas.DataFrame
    """
    vers2 = 'custom'
    return changes[(changes[vers1] != changes[vers2])].dropna()