Yorikiri vs. Oshidashi: What's the Difference?

Yorikiri and Oshidashi Definitions
Yorikiri
(sumo) A kimarite in which the attacker drives his opponent out backwards while maintaining a constant grip on his mawashi.
Oshidashi
(sumo) a kimarite in which the attacker pushes his opponent out of the ring, maintaining hand contact at all times