Two iPhones, buth synced but with different contacts

I have two iPhones and I would like to have them nicely synced calendar and task, but to keep different contacts. One is an office phone and I would like not to have my private numbers etc. Currently, on my old phone I have mail + contacts synced with Google, and Calendars, Reminders on iCloud, same as on my MacBook Air.

All advices are more than welcomed!

Thanks PM