You may be hard pressed to hear a difference initially, I think you'd want to test it on the bench (or listen to the manufacturers who have done this for you). Added jitter can make subtle changes that you may or may not be able to decipher, but will ultimately affect the sound. If you had a rig where you could instantly switch then I think you could put your finger on it.
Regardless of the above, dac manufacturers put a lot of effort (and hence cost to us) into minimising jitter so I wouldn't risk wasting their efforts by using a shorter cable. Some companies don't list cables shorter than a certain length and if you request them, they don't discount.
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