Well, ok. He is getting the better of Lewis in these cars, because the safety car timing has fallen in his favour almost every race.
That doesn't seem like a very logical bit of data to base anything on (espeically not for an F1 team)
Luck aside, they are clearly showing they are quite close to each other in terms of talent/pace at the moment. This shouldnt really be a surprise to anyone as George has been touted as one of the next big young talents (like Leclerc, Norris etc). Merc signed him to no doubt hopefully be their no.1 in the future.