My work pc has both versions 2K & 97, running Windows 2000, and I experience no problems. The only slight nuance is that v97 was installed first, and so the registry keys all point to v97 whenever you try to open a database - regardless of what version the db was created in.
All you need to do is that if you have a 2k or 2002 Access db, you just open th db from within the correct version of Access - e.g. File>Open from the menu bar, or "Open an existing file" from the startup screen.
Incidentally, a later version of Access will open a 97 db, and give you the option to convert it, or to open it as read only (you cannot make any changes to the db structure in read only mode.)
If you try to open a 2k / 2002 db in v97, you will get an "unrecognised file format" error message.
This is based on my experience, and other 'dual version users' may experience other difficulties or issues I have not encountered - as some American board members may say, this is just my 2 cents worth!!