Yeah man, as it says up they are the same frames, with different lenses.
Spherical lenses are better hence why they are more expensive.
They give you a better field of vision aswell as better perception. I have alway gone spherical since trying them on as it's just normal. You get less reflection off the inside too.
If you're budget can handle it then buy the EG1s' but if not, the EG1 will do the job fantastically.
Electric are a fantastic company and there products are top dollar so you'll be happy either way.