Last year because of the COVID accommodations, our HS bands entered as NV and SNV and sight read the same level. We had kids playing in both bands, mostly switching between Euphonium and Trombone. They literally played the same part, just on a different instrument.

We alerted our region about the potential problem and they were cool with it. Your region may be different but ours was even pretty loose with the "not read, rehearsed, or performed" part of the rules because kids were on different instruments.