There are lots of difference between save and submit,
U can save the form by name of your choice but when you submit the form it gets submitted with the name mentioned in the data connection.
Conditional formatting, data validataions gets fired on submit click, not on saving the form
But you can submit both the saved and the submit form from the form library only.
On saving the form, values entered gets saved but they are not passed to the form library columns with which they are linked.
I think, my points here have answered your question.