Yes to the first set. You might want to put the details of these wheels and your existing wheels into the calculator on
www.willtheyfit.com so you can see what the difference in stance is between your existing set up and what it would be with these wheels fitted.
The second set - I’m sure they’ll fit if they’re genuine OEM wheels, but there’s no details of the size given other than diameter. You’d need to know the wheel width or offset given to be able to tell what difference there’ll be in stance with these fitted. Maybe someone with these wheels on their Leon FR will be able to advise on width (J size) and offset. If they’re genuine, then I’m assuming the PCD is 5x112 and the centre bore is 57.1.
With both sets, I’d be asking the seller to confirm they’re not bucked / they’ve not been repaired, and I’d want to see a picture of the reverse of the 18” wheels to see the markings on the reverse of the spokes - part number, diameter, offset, manufacturer’s name and Seat logo. I’d also want the seller to confirm the dirt on those 18” wheels isn’t hiding any cosmetic damage!
On a related issue - I struggle to understand why people advertise wheels in such a dirty condition. Do they want to sell them? If it was me advertising wheels for sale, they’d be thoroughly cleaned - front and back - to show them off at their best to increase the likelihood of selling them! Rant over.