Depending on who you’re talking to, there is no difference. However, from a descriptive point of view, side swept bangs are longer and pushed to the side, whether they need to be clipped, or stay willingly.
Side bangs are bangs that are cut short in a layered / feathered cut and get longer as they get closer to one side of your face.
If you’re getting your hair cut and need to request one or the other, it would be better to describe what you want instead of using a term for it.
The hairdresser could misunderstand.
Also, if you’re not sure how side bangs will look, start with sideswept bangs so that you have the option of cutting them down to sidebangs or leaving them longer.
Good luck !