At those lengths, your cable length difference is absolutely NOT an issue. You would need to have cables much longer before that ever becomes a consideration (typically somewhere in the range of 50 ft or more...).
That does not mean that there will not be differences in cable properties. In well made (ideal) cables you should be able to mix-and-match w/o any differences but in the real world there will be occasional cases where cable materials, construction, whatever might produce some measurable differences. Whether that translates into a difference that you actually can hear is another thing...
That does not mean that there will not be differences in cable properties. In well made (ideal) cables you should be able to mix-and-match w/o any differences but in the real world there will be occasional cases where cable materials, construction, whatever might produce some measurable differences. Whether that translates into a difference that you actually can hear is another thing...