Depends on whether the version of Rome Total War you have contains CUF files (with .cuf extension).
You can check whether they will work (if you have them) by trying to preview them. If that appears to work OK (you get a nice preview rendered in the given font), it means that your CUF files from RTW are structured the same way as those from M2TW and that in turn means you can use the program to create your own replacement fonts.
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