The differences in the blades is for the material and kind of deburring you are doing. Deburring steel uses a steeper cutting edge and aluminium or some plastic uses an acute edge. Small hole blade is different than one for bigger. Attached is a page from Vargus, they sell/make the tools, giving a better explanation. Poke around the rest of their site for more information. Noga is another big name in deburring tools and worth a snoop.
OR............... get yourself a small half round files, anneal it and file, grind it to a round tip filing.grind all the file serrations off till it's smooth. Heat it to bright red hot and dip in clean water, shine it up then reheat slowly till a straw colour and dip in oil. You will have a scarper/hole de-buurer for life.
I did this over 50 years ago in my first week in a tool room, i still have it and never sharpened it. Old school.
Wow 50 years! I wish I had that much experience. I'm wanting a hardened version so I can use it on more materials. Does the tungsten finish make the blade better for hard metals? I like the idea of being able to switch the blades out for different applications.