...and I found out the hard way. I ended up with two doors I thought were the same until I put the lower access panel on and discovered the difference....one was a '54 and had no way to use a machine screw to hold the panel on. So they both would be alike I used a rivetnut/nutsert on the 54 door.
Live and learn! .... and thanks to ret.wrenchbender for helping me sort that out. Caught me by surprise.