(Genki 2) Please check my understanding for te kureru vs te morau

• -te kureru: when someone does you a favor without you having to ask. you're lost at the train station, someone comes over and helps you.

Eg. えき で は、 しらない ひと が わたし に てつだって くれました

• -te morau: when someone does you a favour, but you had to ask. you're lost at the train station, so you ask someone for directions, and they help you.

Eg. えき で わたし は しらない ひと に てつだって もらいました。

In addition, the other difference between the two is that

• When using kureru, the the subject of the sentence is the giver.
• When using morau, the subject of the sentence is the receiver.

And that's basically all I need to know about those two at this level (Genki 2), right?