You are going to need to base64 decode that into something OpenLDAP can understand.
With the example password you showed, you would use:
It should come back as plain human readable letters. If you see any binary characters, than the string you pasted in is not correct.
perl -MMIME::Base64 -e 'print decode_base64("e1NTSEF9TVl3ODZCN1F5MEZqeWuT2JmT2F2eWtxR2M0Y2JLVlk=")
But it should show you something like:
and then you can set the password using that new string in the other OpenLDAP instance.