How hard is if to swap a 1971 or 1972 dart front end on 1973 dodge dart sport

It’s an OER spoiler for a ‘67 Camaro.

CHEVROLET CAMARO OER 3916673 OER Injection-Molded Front Spoilers | Summit Racing

It’s not a perfect fit but because it’s ABS it works fine. A heat gun makes it easier but it’s not necessary. The 68/69 spoilers work too, they’re a bit wider but not as tall. I liked the taller ‘67 version. For $30 it’s hard to go wrong.
Thanks!