Four sentences

1) She looks over at her friends to see Nelly smiling at her.

2) She looks over at her friends and sees Nelly smiling at her.

3) She looks over at her friends to see that Nelly is smiling at her.

4) She looks over at her friends and sees that Nelly is smiling at her.

- Are sentence 1 and 2 just as good as sentence 3 and 4?

- Are the sentences with "to see" just as good as the sentences with "and sees" if she had no idea that Nelly would be smiling at her before she looked? (If you know what I mean)