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I would think that you would if you want to be 100% safe. Once you complete the upgrade on bank1 you need to unlock and turn the engine 360 degrees clockwise and lock TDC on bank two. The idea of TDC is to take all the tension out of the bank in question.
I'm sure there are people who would say you don't and I would guess that it is totally possible to do it without locking. it is really based on your personal risk level. Looking at the cam shaft notches can tell you if you are out of time.
On the exhaust cams you will see the notch is not centered. One edge of the notch is on the center line and the other edge is offset. When the bank you are working on is in TDC that notch will create a small "C" and bigger "C". The bigger "C" needs to be on the side closest to the crank and the smaller "C" will be on the valve cover side. This lets you know which bank is TDC.
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