Something does not make sense. If extra length of cable does not make a difference then why Valhalla - very expensive IC.
You probably believe that cable makes difference and it is proportional to distance and your question is "how much of a difference". I would still not use uneven cables because small errors like that will acummulate and will become audible. In addition you might get more revealing gear in future - why to risk.
It is more complicated than capacitance or speed of signal - there is also inductance, ratio of inductance to capacitance, dielectric constant etc.
In addition - what if you decide to change cables - who is going to buy it from you? (most of people believe in the same lengths).
You probably believe that cable makes difference and it is proportional to distance and your question is "how much of a difference". I would still not use uneven cables because small errors like that will acummulate and will become audible. In addition you might get more revealing gear in future - why to risk.
It is more complicated than capacitance or speed of signal - there is also inductance, ratio of inductance to capacitance, dielectric constant etc.
In addition - what if you decide to change cables - who is going to buy it from you? (most of people believe in the same lengths).