How to find matching moulding for panelling

My wife's tasked me with panelling the wall going up the stairs. We have this decorative panelling on the staircase which looks fairly old. Ideally I’d like to find similar moulding so I can match it. How would I go about finding something similar? Is there any specific terminology I should be using or do I just need to scour multiple pages/places for something similar?

Other option would be trying to create it myself, but as I don’t have a router that would likely cost a fair bit more in tools. (I’m not opposed to it as I’m slowly building out my collection anyway)