Can using a MB power adapter with a MBP become a problem?

I got a late 2008 Macbook here and a early 2008 Macbook Pro. I noticed that the power adapters are of different size. When I use the power adapter of the late 2008 Macbook with my early 2008 Macbook Pro, it gets quite hot which, I assume, is due to a higher power requirement of the early 2008 MBP.
Can this become a problem?

Although I cannot say for your particular combination, the general rule tends to be that a power adaptor that is lower in power rating than what was issued can run the computer or charge the battery, but not both. There are time when you need max power. It's obvious from Apple docs and reports here that the MBP can draw from both the battery and AC power under extreme workload condition. In such a case the battery would run down, something less likely to happen with the proper adaptor.
I have a pre-owned PowerBook G4 17" that should have a 65W power adaptor but came with a 45W unit. It will not start on AC power without some charge on the battery. That's the stuff you can encounter.
Did you notice that the Late 2008 Macbook Pros rate their own new forum here:
http://discussions.apple.com/category.jspa?categoryID=251

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