I'll trust the datasheet, the multitester might mistake.
If in doubt, use a very high resistance (100k ... 1Mohm) series with a voltage source of at least 10V DC, and in series with the base. Reverse polarize each junction, one at a time. On the BE reverse polarized there should be about 6-7V or so (the BE breakdown/Zenner voltage), on the BC reverse polarized should be more, upto 40V if the DC source is that much. Whichever measures more when reverse polarized, that is the BC junction.
My multitester has different pinout on each side of the socket.
What is it written above the ZIF socket, on the other side, still 1, 2, 3?