You’ll get “ Function Restricted due to Missing Message(s)” but that is expected with these late panels in early cars and can be ignored.
For fit it’s hard to get the sharp line where it joins the other panel. To make a good job of this I wrapped some sandpaper around one end of a long/thin bit of wood, say 1cm x 60cm, and sand each one whilst the other end rest on the other bit if you see what I mean. This ensures they are straight and at the same angle to each other, if you’ve cut them to the correct length, it also avoids them going slightly rounded when sanding freehand. Colour match looks good 👍