Muddy
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HP is 65 - 75% peat, with the balance being perlite. BX is 75 - 85% peat with the balance being both perlite and vermiculite.
Yes, as far as I know. Really the only difference between the two mixes is that HP has more perlite and dries quicker than BX under HPS/MH.
That's why we recommend using the BX for HPS setups and the HP for T5,cfl and LED grows. I use BX with T5 and cfl, but I add plenty of extra PLAIN perlite to my mix, thus making it more like HP.