The only information that I was able to find was than on straight line apparently the stock Boss is slightly faster than a stock 6th gen Camaro SS, and also that on a MT test the 5th gen Camaro ZL1 was much faster than the Boss Laguna Seca at the track. Just by thinking that the 6th gen Camaro SS performs similar to the 5th gen ZL1, that maybe it would be able to beat the base Mustang BOSS at the track, I haven't be able to find any direct comparison between both.
https://youtu.be/OE4AH4DZtEI
https://youtu.be/kA1f6mDWgaM