Can't open iphoto library from external hard drive

I'm backing up my enormous iPhoto library to two external hard drives in order to free up space on my computer. Before deleting the photos permanently from the laptop, I wanted to double-check that the copies of the library I made on the two externals would actually work on another computer, should something happen to my laptop. When I plug my external hard drive into my laptop and use option+click on iPhoto to choose which library I want to use, it opens up the library from the external just fine, no problems. However, when I plug the same external into a different Mac computer and do the same process, I get the immensely frustrating message of "You can't open photo library blah blah blah changes have been made using newer version of iPhoto". However, both my laptop and the second computer are running the exact same version of iPhoto (the most recent), so that can't (or at least shouldn't) be the problem. I found suggestions to rebuild the library, which I did, but the same result occurs. I double-checked to be sure that neither computer needed updates (they didn't).
When I plug one of the externals into the second computer, though, I can open up the package contents of iPhoto library and all the photos are visible, so I know the information is all there. But I don't want to lose my albums, etc.
So do I just delete the copies of my library from the externals and try it all over again? I'd prefer not to, since I have 40,000+ photos, and that takes a while.

To reinforce what Larry pointed out both Macs must be running the same version of iPhoto.  And the external HD must be formatted as shown in this screenshot:
and don't forget the ignore ownership.
OT

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