If you get a new laptop, it will have Windows 8.1 on it. Or you should upgrade from 8 to 8.1 immediately.
There is no way to know if they will work or not until you try them. We have a Windows 8 and Games stickied at the top of the Glitches forum and you can see we've had pretty good luck with our old games and Windows 8. However, if either of these games is 16-bit, then they will not work.
You can always try using the compatibility mode in Windows 8 to see if they will work if they won't install or play normally. That's worked for me several times.
EDIT: I see that GOG has all the King's Quest games and it says they will work on Windows 7, so they should also work on Windows 8. So if your old disks won't work, you can always get the games there. They have the games in bundles of 3 for $9.99.
Heading for the gardens!