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W43-MM1 is a young region, very rich in terms of high-mass star formation. Weaim to systematically identify the massive cores which contain a hot core andcompare their molecular composition. We used ALMA high-spatial resolution (2500au) data of W43-MM1 to identify line-rich protostellar cores and make acomparative study of their temperature and molecular composition. Theidentification of hot cores is based on both the spatial distribution of thecomplex organic molecules and the contribution of molecular lines relative tothe continuum intensity. We rely on the analysis of CH3CN and CH3CCH toestimate the temperatures of the selected cores. Finally, we rescale thespectra of the different hot cores based on their CH3OCHO line intensities todirectly compare the detections and line intensities of the other species.  W43-MM1 turns out to be a region rich in massive hot cores with at least 1less massive and 7 massive hot cores. The excitation temperature of CH3CN is ofthe same order for all of them (120-160 K). There is a factor of up to 30difference in the intensity of the complex organic molecules (COMs) lines.However the molecular emission of the hot cores appears to be the same within afactor 2-3. This points towards both a similar chemical composition andexcitation of most of the COMs over these massive cores, which span about anorder of magnitude in core mass. In contrast, CH3CCH emission is found topreferentially trace more the envelope, with a temperature ranging from 50 K to90 K. Core 1, the most massive hot core of W43-MM1, shows a richer linespectrum than the other cores. In core 2, the emission of O-bearing moleculesdoes not peak at the dust continuum core center; the blue and red shiftedemission correspond to the outflow lobes, suggesting a formation via thesublimation of the ice mantles through shocks or UV irradiation on the walls ofthe cavity.

ALMA-IMF IV -- A comparative study of the main hot cores in W43-MM1: detection, temperature and molecular composition