The answer is - Yes and No.
Speaker wire lengths CAN matter, but it rarely does.
So what lengths are we talking about 10 ft on the Left, 3ft on the Center and 50ft on the Right? That might matter.
If you scroll down to the chart at this Wikipedia Link -
You will see the impedance per unit length of wire.
is 8.23 milli-ohms per meter (0.00823 ohms) (2.52 milli-ohms per foot, 0.00253 ohms)
Let's use ohm/ft.
1 ft = 0.00253
10ft = 0.0253
100ft = 0.253
So, relative to an 8 ohm speaker, 0.253 ohms (100ft) represents 3.16% signal loss. Generally 5% is still considered acceptable loss.
A 5ft cable would be 0.0127 ohms and a 20ft cable would be 0.0506 ohms. 5ft assuming an 8 ohm speaker represents 0.159% loss and 20ft (assuming an 8 ohm speaker) represents a 0.633% loss. The difference is 0.47%. If we simply look at it in terms of ohms, the difference is 0.038 ohms. Again microscopic. Unhearable.
So, no, assuming reasonable length, and assuming reasonable size wire, it is not really going to matter.
However, you are cutting cable for one specific situation. That cable might not work in other situations.
Can you give us the distances involved so we have some perspective?
If it is 10ft on one side and 5ft on the other side, I say make two 10ft cables so the cables will always be usable in nearly any situation you encounter.
However, if one is 20ft and the other is 5ft, then would be inclined to make one 20ft and one 10ft. Again, so the cables could be used in more situations.
But, assuming reasonable lengths, meaning perhaps under 30ft, the resistance difference is microscopic and inconsequential.
However, you haven't told us the lengths and you haven't told use the wire gauge,
leading us to make sweeping generalizations. If you want a specific answer, we need specific details.
There one additional factor, as wire gets longer, approaching 50ft, cable inductance
start to trim away at high frequencies. But even at 50ft it is just starting, to really become significant, the length has to be longer to be relevant. Though this is just from memory, with 2.5mm² wire, I think we have about 3% loss at 12,500hz. Not very significant. Keeping in mind that 5% loss is considered acceptable.
So, what lengths, and what gauge wire?
But generally speaking - no, it won't matter.