I agree with Phatninja55. It would be best to compare the output of your Sammy charger with the Chacha. It's most likely fine but a bit of research could save you some grief.
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Have a look at the Samsung charger, the specs should be written on it.
If you see something like "Output 5V/1A" (or a bigger figure as 1A, like 1.2A or even 2A) then you can use the charger for your HTC phone.
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