19% shooting vs 42% shooting. Hmmmm
Last season, Laine's shooting % in the slot area(high danger) was 56%. This season, Laine's been shooting more from the slot, which means that his shooting % has been going up - especially lately. In any case, the shooting % comparison you should use is his season shooting % 19.7 vs his career shooting % 18.7. It's slightly higher but within sample size - It's possible that his first season, he shot at a lower rate than expected.
Note that Matthews's 19 shooting % at the time was also assisted by enormous high danger scoring chance ratio. Laine's always had a very low amount of high danger scoring chances, yet he still has scored a higher amount. I performed some maths and using Laine's last season's slot shooting % and Matthews's last season's slot shot amount, Laine would be approaching 150 goals for the season.
That naturally means that Laine's expected to have a significantly higher shooting % than Matthews in relation to their scoring chance quality. Using the sample sizes available to us, which admittedly isn't a whole lot at this point in their careers.
It also means that you have to consider xGF completely differently for both players because Laine's expected to score far more goals with the equal xGF.