Macbook Pro power cables

Hi
I bought I macbook pro in the summer of 2009 and then in 2010 I dropped it on the floor and this summer got a replacement. I'm pretty sure the new MBP I have has some sort of different power going to it than my old MBP - I believe the new MBP functions on less wattage.
My question is whether using my old power cable with my new MBP is in any way dangerous. I'm not talking about my mac exploding or anything like that, but, for instance, my isight camera has stopped function, and I'm worried it might be because of too much power coming to it from using (occasionally) my old MBP power cable, and perhaps burning it out in some way.
Is this possible? Should I be sticking to only using my new power cable, or will it make no real difference?
Thanks for any help.

to supplement the above. Apple portables can actually pull more power than the power adapters even the 85W one can supply thus is why it is ok to use an adapter with a higher wattage than the one that came with your machine. This is also why if you run your apple portable with the battery pulled out, the portable will run at reduced speed.
found this out when my pre-unibody mbp battery bloated on me and i couldn't get a replacement for a week while i live and had to deal with an extremely slow machine

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