Re: How might I sync a Mac on one iCloud account with an iPhone on a different iCloud account?
You can only have one iCloud account signed in on each device at at time (under Settings > iCloud or > System Preferences ... > iCloud). But there could be a work-around for what you want to do:
Originally Posted by ckillam3
Not sure if it will give you the results that you expect, but you can add the iCloud account to the phone under Settings > Mail, Contacts & Calendars and just select the items that you want to sync (calendar, contacts, notes & reminders).
On your Mac, go to > System Preferences ... > Internet Accounts and add the iCloud account - again, just checking the items that you wish to sync, as above.