I think they are close, I think you will find they are all cast aluminum like factory, I have seen lots of the Mark VIII wheels flexed so bad all the chrome falls off. I can't say I have seen any aftermarket ones do that. I think it is like anything else, you get what you pay for, and there are quality reproducers and crappy ones.
97 Mark VIII LSC/Silver/Gray leather
97 Cougar 4.6 Sport/White Opalescent Tricoat Metallic /Gray leather down but not out?
89 Cougar LS 3.8/Oxford White/Gray velour/HG need replaced AGAIN
00 Grand Marquis LS/Vibrant White/Gray velour
63 Falcon 302/black and rust/shed isn't moving
82 F-150/Oxford White/dumb VV carb doesn't pass emissions