Yes, with both backplate nipples so close together I really don't see how it makes any difference, unless one of them has a check valve in it.
Cathurga, I seem to remember the tube, that you show with the red arrow , is always filled with oil when it's running and also when it's shut down ,so I wonder if that blocks what your concern is with the unregulated flow . It always looked like dark oil ( I used redline 35:1 ) in the tube which means it was traveling from crankcase to intake manifold, is my guess. Never really stood there and watched it flow while running, never really questioned it.
Next question, Is there a rpm rev limiter available for our size applications ? ANYBODY ? Cheers, Ed