High beams are not "handed" with respect to traffic. Sealed beams that produce a low beam are available for left or right traffic. The RH-traffic items are marked "2A1", "2B1", "2C1", "2D1", or "2E1" depending on size, shape, and configuration. The LH-traffic equivalents either have an "X" in place of the "1" (such as "2AX", "2BX", etc.) or they have an "X" after the "1" (such as "2C1X", "2E1X", etc.). Sometimes, as in the case of the lamps you linked, that kind of code is also found on replaceable-bulb headlamp sized and shaped for direct replacement of sealed beams, but not type-approved to ECE regulations -- that is the case with the lamps you linked, which were built to conform to the old Japanese standards. Note the aiming pads and the "2EX" marking in the upper left corner of the lens.
H4 headlamps are either for RH or for LH traffic, not for both.
Whether a Hella H4 lamp is substantially better than a Night Hawk sealed beam depends on which Hella H4 lamp is being compared, and what you mean by "better".