1965 Barracuda door issue

Wondered if someone could clear something up about a door correct issue. So I bought a supposed 1965 dart door for my 1965 Barracuda but the lock cylinder hole is circular but my Barracuda other door is a small hole with a notch. Wondered what I really have here and if I’m screwed because the dart door is ready for paint. I’m kicking my self for not checking the cylinder hole earlier. I was told even though a dart door it would still work fine. Let me know and thanks.