Wu Sangui Cash Coin Attribution

Just from judging from some of the Japanese coins I have, I would say it's a match. Sometimes the molding of the coins aren't spot-on on each coin so there can be small differences.
Sometimes a line will be smaller or longer than it is suppose to be or thicker or thinner.

Thanks for the replies everyone. I'm still relatively new to cash coins so its good to know that there is some variation.

My only remaining reservation is that there appear to be other varieties in the catalog (Hartill) that exhibit some of the the exact character variations mine does. While these coins are more similar in some ways, the bottom character of 21.85 is distinctive compared to the others and matches mine.

It seems odd to me that features distinctly depicted on other coins would be within the range of normal variability, but like I said I am new to this.

Don't worry too much about the variability on some characters, especially coming from any of the Yunnan mints. Yes, mints. There were a few mints in operation in Yunnan at this period, usually located near the various copper mines.
21.85it is, unless there is anything on the reverse - li or yun.
For more detailed variety typing than Hartill, use the Daxi or Daji (two separate works, both in Chinese). Hartill suffices for most coins though.