They would just share the pressure.
Each would pass half the air a single unit would vent.
No Each would pass half the air of one.
As the BOV is set at a X pressure they would release at the same time
under the same pressure but would escape twice as fast
Get two coke cans, shake them.
Poke one hole in can A.
Poke two holes in can B.
The pressure of the liquid ejected from Can B, will be half the pressure ejected from Can A.
Twice the total CFM, half the pressure.
Cant use the can theory here. Its Not the same as BOV as the BOV is pressure set.
Twice the CFM but same pressure as a single BOV.
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