It would be a leap to assume another culture has something similar to (or, in some cases, anything resembling) one's ethics, sense of humor or taste in music. In comparison to these things, science has something they do not: apparently universal and impersonal 'laws', which, where we can check, appear to hold across the visible universe (putting aside some unresolved issues on the leading edge of our present knowledge.)

For some extra-solar civilization to examine the probe and its plaque intact, it will have to rendezvous with it in space. It seems to me to be the greater leap of faith to suppose this can be done without having knowledge that is isomorphic or equivalent to our formulation of orbital mechanics. Do you have any concrete ideas about how this might be so?