What is the difference between straw briquetting machine and straw forming machine?

I remember when my brother and I bought your straw briquetting machine together, Manager Wang said that the straw briquetting machine could only be used instead of coal. I remember my brother specifically asked at that time that the straw briquetting machine was mainly aimed at feed, so it should be ... or it should be different from what kind of fuel or feed it produces. Basically, the principle and structure are the same! !