I can tell you for sure the 67 and 68 latches and/or hoods are different. 69 no idea.
Found out the hard way back in 79 after installing 67 hood on my 68. It didnt latch as hard vs 68 hood.
Already had a security chain with pad lock thru hood braces and around center latch support. Was testing carb and timing on my street, so didn't put chain back on.
3rd test run it popped open and slowly came to rest on roof as i braked as easy as possible.
Did some fabing and adjustments to make it safe. And installed the chain lol.