Measure them all first. determine which need to be replaced and remove 1 at a time those that will need replacing and see what the current size is, then replace the current shim.
This will give a list of what shims you will need to replace and which will become eligible to be moved elsewhere.
You would have to be very lucky to just be able to shuffle things around without a spare, and it could get very complicated. Buying a couple 2.65 shims in advance is the most likely way to get the shims you will ultimately need (60% of the time this would do the trick).
OR. borrow my shim & tool kit with a variety of shims in it. I only ask that any shims used up 2.70 and under be replaced. Others can be swapped around for your bikes'. And pay my postage ($8.50)