Q: I was wondering if a Consultant at the Oliver Wyman London office can refer me for the same position but in OW's Dubai office?
Yes they can, however the referral will be stronger if the person is in the same office (they could directly talk to HR/forward your resume to them).
You can learn more on referrals here in case you want to look for one in Dubai:
▶ How to Get Referrals for Your Application
Hope this helps,