Same height.
Different waves.
Two reports can give you the same wave height and describe very different oceans. Period helps reveal why.
Height is one measurement. Rhythm is another.
Wave height measures the distance from trough to crest. Period measures seconds between crests. A longer-period deep-water wave has a longer wavelength and a faster crest speed. This does not guarantee better surf: direction, local wind, tide, and the seafloor still matter.
Read a buoy like a scientist.
NDBC significant wave height represents the average of the highest third of waves in an observation period. Dominant period identifies the period at the spectral energy peak. Neither directly tells you the height of a breaking wave at Devereux.
A useful question: “What other information would I need before I trusted this number at my beach?”