See the attached screenshot
When having two variables assigned the same constant value and I mark the first and selects "Introduce Parameter" it suggests the name of the second. For example :
intOne = 4; //Introduce parameter here suggests the name "intTwo" for the parameter (although I choose to replace only one occurrence)
intTwo = 4;
I did not manage to recreate a simple example using ints or strings (although that seems also to be buggy but less severe) but my case as seen in the screenshot is using my own type.
Hope you understand what I mean.