well THEORETICALLY yes but why? I mean, rather take clones? When taking clones you can apply a root stimulator to make them develop faster, however I'm not sure if ganja specifically can "connect" with another plant's roots. Perhaps if the strain is the same and the bath of seeds is the same...
They are looking fine but the images are blurred, just use the micro and see if the trichomes are milky. If you - you can harvest. If transparent - too early. If orange - too late. Simply as that