Assuming all three cables are exactly the same manufacture, the signal will take longer to go through the 30' cable. Assuming a Velocity of Propagation of 82 (typical for RG6) the delay per foot is 1.24176461705966e-9. Will a less than10 nanosecond delay be enough to be visible? Probably not. FWIW for about $10 you can get a proper Component cable from Monoprice.
edited to reflect correct VOP for RG-6.
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