This may not matter in the long haul, you fix what you need to fix to make it right. Especially with the two reproduction panels. As the great philosopher Nike said, "Just do it".
But if you want to figure out just what is wrong here you can make a template off the other quarter and door (if those are still original).
Take a piece of cardboard and hold it up to the edge of the quarter and mark a line down it showing a rough edge of what you need to cut to get the card board to fit up against the edge for a better cut later.
After cutting that rough stuff off, it looks like this.
Hold it against the edge of the quarter in the jamb and trim it until you can get the piece in there and have a very defined top and bottom. In this case at the very bottom near the rocker it is setting on the rocker and right up against the back corner. At the top it is right at the edge of the quarter where the quarter window "scraper" moulding is.
Now a perfect line can be draw up the edge of the quarter onto the cardboard.
And finally, the cardboard is cut right on that line and you have a piece that can be flipped around and used on the other side to see how close it is to the original.
The same can be done with the door, which one is correct?