I assume you mean 3rd party scenery. Some might work OK. The only way to find out is to try it. Providing it's installed correctly & activated via the Scenery Library it will do no harm & is easily deleted. Updates to existing FS2002 airports will obviously be no use. I always thought it best to use proper CFS2 scenery where possible.

PS. I've never tried it but wouldn't expect the FS2002 default scenery to be compatible with CFS2.

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You don't say if this was default or 3rd party scenery. I've already said that I wouldn't expect the FS2002 default scenery to be compatible with CFS2.

If it was 3rd party scenery this would depend on how you installed it. Providing you install it separately & activate each new area via the Scenery Library, no scenery should do any permanent harm. If there's a conflict or other problem, simply delete it from the Scenery Library.

For the correct way to install 3rd party scenery to CFS2 (or any other M$ sim) read my tute here. http://www.simviation.com/lair/cfs2scenclinc.htm