Those images are VERY different things. PM is a error for the DS firm. and the other means something different from that. You cannot go by similar as they are all likely different.
normal ntr will only allow for one game open. then you gotta fully reset the console. And the game bowsers inside story. it is noticeable that the sprites will disappear for that title. which is why the codes are layed out differently.
from google?
And as for safe source....Is there really ever a safe source for anything? One person can place anything they want to make a source unsafe. Just read and be mindfull when ya find one.