The tool on the right is a shave hook used for sraping paint or finishing moulding and other irregular shapes in wood. Here is another example.
While the shapes aren't quite the same, they are similar enough to be the same tool. I'd guess they would be available in several configurations, to match a specific job? I knew it was a scraper. I just didn't know for what.
The most common seem to be triangles, ovals and teardrop but I imagine that they may have been custom made for a specific job as you indicate. Tom. Wow page 1200!