The phrase "same yardstick" means using the same standard or measurement to judge or compare things. It suggests treating everyone or everything equally and fairly. Full definition
«You can measure opportunity with the same yardstick that measures the risk involved. (inc.com)
Jesus doesn't measure sucess by the same yardstick as we do. (nakedpastor.com)
The turning point of the game was taking off Koscielny, as the leader of the team he had to fall on his sword for such abysmal performance, but I just wish Wenger will measure himself with the same yardstick and take responsibility for the team's failures when like Koscielny today, he fails to motivate his players, it is no coincidence that Mustafi has still not lost a game with us, it's called leadership!! (justarsenal.com)