Importance Of Variable Names

Can anyone see the problem with this bit of code?

    public class InterfaceKitDigitalOutputCollection
    {
        // Fields
        private IntPtr phid;
 
        // Methods
        internal InterfaceKitDigitalOutputCollection(InterfaceKit phid)
        {
            this.phid = phid.phidgetDeviceHandle;
        }

I changed the local parameter

        // Methods

        internal InterfaceKitDigitalOutputCollection(InterfaceKit interfaceKit)

        {

            this.phid = interfaceKit.phidgetDeviceHandle;

        }

And suddenly the code is more consistent and readable.  A small change to be sure, but I lost 5 minutes assuming that variable names were unique in the class.