The spigot is the raised ring on the wheel hub that locates the wheel. It should match the big centre hole in the middle of the wheel, If the one in the wheel is smaller it wont fit if it's larger thewheel wont centre correctly and will probaly wobble
Good Luck Buddy
Hi Ian
Welcome to the Forum
Check www.realoem.com put the last 7 digits of your Vin into the search box (one car at a time) then check the wheels section. Check the wheel szes for both cars and the wheel Offset so you know they clear Brake Calipers
The only other thing is check the spigot ring measure ment on both wheels
Hope this Helps
Dave