I do not believe this to be true. Push feed Bolt heads work fine with a Stagger feed magazine box.
As for the head space I would check it. Two different designs and no telling if the critical dimension is the same.
The next issue would be the firing pin diameter and the new bolt head. This is an easy fix though. With the correct drill bit it is simple.
I try to tell people to count on the drill bit being at least .002" oversize after the hole is drilled. That means you want to use a bit that is very close to the same diameter or < than your pin diameter.
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