I would highly recommend using the same cable for both, or at least same manufacturer and in similar quality. There’s subtle difference (and sometimes more than subtle) between different cables and manufacturers and you will hear that as a disconnect between midrange and the highs.
Different types of cable for bi-wire
Any issue with doing high gauge silver cable for the the high frequencies (24 or 26 AWG), while using a low gauge copper cable for the lower frequencies (like a 10 AWG)? I am thinking if they are the same length there might not be an issue here, but wanted to confirm. Was wondering if there could be any sort of timing issue or other issue with the different conduit. Thanks