SACD players decode SACD disks and transfers that data stream via I2S circuitry internally for decoding internally only. Toslink (optical), coaxial (rca), and aes-ebu (xlr), are all SPDIF (Sony-Phillips Digital Inter Face) and only transmit PCM (pulse code modulation), and DSD over PCM.
That said, cables matter! Very much! Conductor type, size and purity, insulation (dialectric), geometry, length and connector quality all contribute to the effect on your affect! (perceptions - mood) 😉
Shorter is better! Lower resistance, capacitance, inductance, dialectric effect, and skin effect, generally speaking.
(Just not to short! 😀)
Some have said USB cables should be at least 1.5 meters long to reduce internal reflections/jitter. I currently use “WireWorld Starlight“ USB cables in 0.5, 1.0 and 1.5 meters. I do not hear a significantly difference among them in my systems!
As always, YMMV!