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It's tricky

The problem is that what you're trying to do is get the cleat in the same position relative to your foot as with the old shoes, and your foot is not going to be in the same place relative to reference points on the shoe (even if you can find truly corresponding reference points on the new shoe).

So I do something like this. First, get a new pair of cleats -- don't take the old ones off the old shoes (if you don't need new cleats yet, you'll have a spare for when you need them eventually). Attach the new cleats to the new shoes, eyeballing to get them roughly at the same position and angle as the old ones on the old shoes.

Then, put the bike on a trainer (or in a doorway where you can balance), get on, and clip in with your old shoes. Spin the cranks a few times, watching and feeling to get a good sense of the position of the ball of the foot with respect to the pedal spindle, as well as the angle of the foot. Do one foot at a time. Stop, put on the new shoe, spin and look and evaluate. If it looks/feels different, adjust the cleat position and try again. Keep tinkering until the new position feels as much like the old one as possible, paying attention also to how your knee moves and feels as you spin.

Repeat with the second shoe. Then, put on both old shoes again, spin for a bit, put on the new shoes, and see how it feels. It may take quite a bit of messing about, but if your old position was good it's worth the effort, since you'll avoid messing up your mechanics (and maybe avoid injury as well).

Remember, there are three adjustment parameters: fore-aft, left-right, angle. They all interact, and you may not be able to precisely duplicate the old position if the new shoe has a different sole shape. But you want to replicate the feel (in knee as well as foot), while actually pedaling.
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