I disagree that our roles in the OR is exactly the same. I work alongside EN's and have a huge level of respect for them as I do for all my colleagues.
But while our physical tasks in theatre are similar (scrubbing and scouting) the RN has a greater level of responsibility and accountability in the OR because it's our role to supervise and delegate to EN's. For example, if the surgical count is wrong then the greater proportion of blame will be given to the senior RN even if the EN was the scrub nurse. This is the same for anything that can go wrong, specimen mishandled, incorrect consent, injury to the patient etc. RN's in the OR also tend to have to take a leadership role by managing the OR list, delegating to staff, ensuring there is enough equipment and stock for each case and basically being the first point of call for any problems.
I have come across RN's that look down on EN's and treat them like dirt which makes me feel ashamed. I have also worked with EN's that are constantly moaning and complaining about their limited scope of practice, yet won't enrol in the RN course. I don't agree with either attitudes.