Quality of internal and external wiring is meaningful in all of the components in our system. I would say the odds are very good that you would find internal wiring for your speakers that would make a noticeable improvement,
However your system is likely already tuned to your liking and introducing another variable in hopes of improved sound is not a sure thing.
Since bulk cabling is relatively inexpensive I would suggest you buy at least (3) different brand specs of wiring and give each one a trial.
Once you find the one you prefer, I would even solder the wire directly to all terminals.
Lots of work but how would you feel if the first set didn't work out?