Power unit from older MacBook Pro - using it with newer model

I once had a MacBook Pro, one of the early version, bought somewhere in August 2006. Now I have the power unit that is left from it. I want to use it with my current MacBook Pro which is newer model, but not the one which is currently sold - it is NOT the unibody model, it looks exactly like the previous model, but with better spec, and the notable difference is that on the previous model the green diode near camera had a single hole, and the newer model has lots of tiny miniholes there, which makes it completely invisible unless the diode is lit.
(unfortunately I have no idea how to identify those two models more correctly - model numbers or whatever)
When I compare the power units - the one which I have with my current model, and the one which is left from the previous, the newer is a bit smaller, and the power output markings are a bit differently organised, not totally identical, but they show what I understand is same voltage/amperage.
I'm still a bit cautious about using the power unit from the older model. Did anyone tried it, is it safe?

Next time you can use Mactracker to identify your machines exactly:
http://www.mactracker.ca/
Go to >About this Mac>More Info and you will see the Model Name and Model Identifier.
Good luck!

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