I use my 7250 car charger for my RAZR with no problems. I also use the 7250 USB cable at work to charge my RAZR. However I did just notice last night that my 7250 home charger will not charge my RAZR. Hope this helps some.
The motorola charger will work - it's unknown what the long term effect is since the Moto charger has a higher output than the RIM charger. Hence the Moto charger charges the RAZR or a BB but the BB charger wont charge the RAZR.