One will be the so-called english version installer & the other international. The only difference is that the international version comes with it's own Java version & forces your computer to use that version & the installer can be switched to any language. Both versions of LW are identical & both can switch languages. I don't know which version java comes with the classic international version. Probably best if you use the english version so you can at least have your java at the most up to date version for os9. VM is virtual memory. The larger java for the international LW will use more resources & is unnecessary! From what I can ascertain, 4.0.8 is the final classic version. That's according to
THIS page (but that's the free version.) I guess one day you may need to think about OSX.