Scene versus Sight

[Van Khanh]

Please read:

1/ This is a delighful rural scene/sight.
2/ The boats in the harbour make a beautiful scene/sight.
3/They went abroad for a change of scene/sight.
4/The flowers are a lovely sight/scene in spring.
5/He saw some amazing sight/scene at the zoo.
6/ A suffering animal is a distressing sight/scene.

These 2 words "scene" and "sight" are interchangeable in only thesecases? If not, please tell me the difference in meaning btw them.

Thanks
K