As long as the milliamps and voltage are not higher then the HTC charger you should be fine I keep my storm charger in my suitcase in case I forget my oem one.
When I travel I sometimes will hit up the front desk saying I left a charger there last time I stayed....They usually have a box of a few dozen chargers they will let you look though....Score!
I use my car charger and a home charger from my Storm on my Droid with absolutely no issues. I do like the Storm charger better because it has a longer wire.