Thanks for the help guys. One is definitely a type 99 according to the chracters on the receiver. However the other one has no characters, just the mum. The other symbols indicate it was made at Nagoya and is a series 10. It looks just like the other action and the barrel lengths are the same too. The one without the characters on the receiver is also the one I think is late war so maybe that's why it wasn't marked?
So now that we've got that out of the way I have a couple of other questions. As far as parts go, are they interchangeable from series to series as well as manufacturers? I had heard that a part from one manufacturer may not fit on a different manufacturers gun. Any truth to that? Thanks for all the help!