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I believe the answer is NO, as all Site content is considered separate, nothing is shared between Sites (other than Admin users). Unfortunately.
I suspected as much, it is a shame...
Yes, it is. I believe the original idea behind Sites was to NOT be relational in any way, in order to secure content more easily. As time has gone on, many users have wanted to be able to share content between sites and I think the early decision to make these completely separate entities has presented challenges for many Server admins.
You can get try to get around some of those limitations by using your own portal application to host your content -- but that also brings challenges and requires more skillsets.
You might find some other helpful info on the Forums; here are some threads that may be of interest:
Cheers and best of luck!