  The High Altitude Water Cherenkov (HAWC) observatory and the High Energy
Stereoscopic System (H.E.S.S.) are two leading instruments in the ground-based
very-high-energy gamma-ray domain. HAWC employs the water Cherenkov detection
(WCD) technique, while H.E.S.S. is an array of Imaging Atmospheric Cherenkov
Telescopes (IACTs). The two facilities therefore differ in multiple aspects,
including their observation strategy, the size of their field of view and their
angular resolution, leading to different analysis approaches. Until now, it has
been unclear if the results of observations by both types of instruments are
consistent: several of the recently discovered HAWC sources have been followed
up by IACTs, resulting in a confirmed detection only in a minority of cases.
With this paper, we go further and try to resolve the tensions between previous
results by performing a new analysis of the H.E.S.S. Galactic plane survey
data, applying an analysis technique comparable between H.E.S.S. and HAWC.
Events above 1 TeV are selected for both datasets, the point spread function of
H.E.S.S. is broadened to approach that of HAWC, and a similar background
estimation method is used. This is the first detailed comparison of the
Galactic plane observed by both instruments. H.E.S.S. can confirm the gamma-ray
emission of four HAWC sources among seven previously undetected by IACTs, while
the three others have measured fluxes below the sensitivity of the H.E.S.S.
dataset. Remaining differences in the overall gamma-ray flux can be explained
by the systematic uncertainties. Therefore, we confirm a consistent view of the
gamma-ray sky between WCD and IACT techniques.
