There is a difference in the text used in the PHB and the SRD which is significant, IMO.
SRD:
SRD:
Full-Round Action: A full-round action consumes all your effort during a round. The only movement you can take during a full-round action is a 5-foot step before, during, or after the action. You can also perform free actions (see below).[/quote
PHB:
FULL-ROUND ACTIONS
A full-round action requires an entire round to complete. Thus, it can’t be coupled with a standard or a move action, though if it does not involve moving any distance, you can take a 5-foot step.
Using the PHB a full-round action requires and entire round to complete which means that at any point in the round (from when you start your action) the action is being done. Hence the simultaneous action comes into play.
Using the SRD the case could be made that consuming all your effort is not the same.
Now, I haven't spotted any errata on the PHB for this (but I will need to check my collector's edition for any "stealth" errata before making a definitive statement here.)
Checked my Collector's edition and the text pretty well matches the 1st printing.
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