Battery charging iPhone 3GS and 4S

I have a 3GS and a 4S iPhone and a iPad 4 in the house and wonder if it is 'safe' to charge the 3GS with the 4S / iPad charger? 
The 3GS uses a 5v 1 amp output unit and the 4S uses a 5.2v 2. 4 amp unit.
Advice please. Thanks

Does any one out there have an answer??
Please.

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