1. No. The mixes for the stereo and mono versions are usually completely different
2. Engaging the mono switch can remove hum that is often endemic to mono pickups. For example with my Miyajima Zero I get hum pickup that is completely removed by using the mono switch on my preamp
2. Engaging the mono switch can remove hum that is often endemic to mono pickups. For example with my Miyajima Zero I get hum pickup that is completely removed by using the mono switch on my preamp