Any audible difference between cheap and expensive BNC cables?

I recently added a Naim streamer (streaming from an SSD NAS) to eliminate my PC (and fan noise) from the equation, plus remove the need to run a USB across the room from PC to DAC. It already sounds better than my previous PC>USB>DAC setup and is connected with a cheap $6 Monoprice BNC to RCA S/PDIF that I nabbed on Amazon.

Would there be any audible difference if the cheap BNC to RCA was swapped out with a higher end BNC to BNC S/PDIF?

I've gotten huge gains from upgrading speaker cables. Upgrading my interconnects between sources and amps on the other hand produced negligible results. The dealer I bought my turntable from has a NORDOST Silver Shadow BNC to BNC at 50% off for just under $300. I'm just wondering what kind of difference, if any, I'd get in sound from upgrading. The Monoprice cable was supposed to be temporary but it sounds good so I'm on the fence about upgrading now since I've always been told digital is digital and buying expensive digital cables that pass the same 1's and 0's doesn't make any difference.

I'm on board with upgrading if it makes an audible difference but want to make sure I'm spending my monies wisely so I'd like to hear some opinions of people who have tested different S/PDIF cables and what, if any, changes they experienced. The DAC has RCA and BNC S/PDIF inputs but the streamer only has BNC out so I have to at least be BNC on the Naim side. The DAC side could be RCA or BNC.

Any thoughts?