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Are there any difference between tr1::shared_ptr and boost::shared_ptr? If so, what?

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No, the documentation of boost shared_ptr says:

This implementation conforms to the TR1 specification, with the only exception that it resides in namespace boost instead of std::tr1.

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Ah. So, there's one difference.
The implementations may differ while still conforming; Notably boost::shared_ptr's dereferencing operators use Boost.Assert to check for NULL (i.e. emptiness) before performing the dereference; while libc++'s std::shared_ptr has no such check. In the case you hit this error at runtime, one will mean an assertion failure, the other a segmentation fault (probably).

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