The difference in Transparent Gen 5 to Gen 6 has been large. I have experienced this in speaker cables, interconnects and power cords. However I have not tried the 75 ohm coax.
Having said that, upgrading it for a Blusound… I would say no. That is a budget streamer, it is extremely unlikely you will hear a difference, and if you do, it may not be better.
The higher the quality level of component the more significant will be the change in sound quality with high end wire. Typically I would not get serious about high end wire until you are over the $2K / component level. If you do, I highly recommend low end Cardas. Cardas takes into account the level of component you are likely to be using them in. The lower end wires are warmer and more forgiving becoming more neutral and transparent with cost.
Transparent are extremely neutral interconnects and cable… really good for high end equipment. They can actually sound bad on low end equipment because they are so “transparent”.
Early on in my audio pursuit I bought a bunch of high end cable for my equipment and could not understand what all the hype was about… they sounded trebly and thin. I threw them into a closet for twenty years. I ran into them again when my system was several times better and they sounded stunning, transparent, great bass (the were Straight Wire). I was shocked… I realized why they were so highly rated… they were great cables and I had low end gear. This is why you have to try stuff and decide, not just buy highly rated stuff and expect improvement.
Also, always replace cables after component upgrades. You want to carefully take into account the sonic characteristic of your components in choosing wire.