Can I copy a Photos library from one Mac to another?

I have upgraded an iMac and MacBook Pro to Yosemite 10.10.3, and am switching to the new Photos app and iCloud Photo Library. I want to keep full copies of my Photos library on both the iMac and MacBook Pro, with an Optimised version of the library on my iPhone.
My iMac has the master Photos library. It is slowly uploading the 28,000 photos in the library to iCloud Photo Library, and they are slowly appearing on my other devices.
The question is, can I copy the Photos library from the iMac to the MacBook Pro via a USB hard drive, and expect iCloud Photo Library to work out that each photo is duplicated in the two libraries, or will I end up with duplicates in iCloud Photo Library? What would be the effect if I were to change the MacBook Pro to Optimised after copying the Photos library?
If I can do this, it will mean I can see my Photos library on my laptop much sooner, and I might be able to get my MacBook Pro to the office which has much quicker upload speeds. I don't fancy taking my iMac in to the office, and my boss might ask an awkward question or two...
Thanks in advance for any advice.
P Diddy

Yes, and no. Yes, if the plist(s) don't contain any pathname info. Obviously, no, if they do, unless of course the other system has the exact same directory structure and filenames.
I should add a little caveat about preference panes. User prefpanes may store plists in ~/Library/ByHost. And the plist filenames in there usually have a long code and letter sequence which I think is machine specific. So they probably would be problematic moving to another machine.

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