Lightroom applies some different settings. Best solution is creating a specific camera profile like described in PIXLS.US - Profiling a camera with darktable-chart.
Maybe a first step can be applying styles created for another canon cam - take a look at the canon dtstyles on https://dtstyle.net/.
There are several styles mimicing Canon presets for the m6 e.g. https://dtstyle.net/download.php/438/Canon_M6%20Standard.dtstyle. Maybe these can be used to achieve a better base for further editing.