Is it possible to show if git branches have the same commits if the one of the branches has been rebased so they don't have the same SHA1...

Is it possible to show if git branches have the same commits if the one of
the branches has been rebased so they don't have the same SHA1...

pI'm trying to get the same effect of running codegit branch --merged/code
but allow for the same commits (commit message + diff) that have been
rebased at some point./p