Either of those CZs will be fine for occasional skeet or sporting clays shooting. They might not hold up for high volume shooting if that's what you have in mind, but it doesn't sound like you intend to be that sort of shooter - yet. However, the CZs especially in 20 gauge are not ideal for trap shooting. They will work for trap for recreational shooting, but you will experience a high level of frustration. Trap is a game of longer shots made easier with a higher, or even parallel, comb that allows you to lock your cheek onto the comb and still see the bird above the receiver and barrel. Guns with sloping combs like the CZs will make that difficult.
Don't let any of what I'm telling you dissuade you from trying the sports out, with whatever shotgun you commit to. Clay birds are really fun to shoot, and if you develop a high passion you can always upgrade. If not, the CZs will last a long time for a moderate investment.
Entry level K-80s go for about $11,000, by the way. The $18k guns have fancy scroll work and upgraded wood that has nothing to do with the actual functioning of the guns. There are plenty of very fine shotguns in the $2,000-6,000 price range that are made for high volume shooting.