I had an old copy of Strikers 1945 II that was a bootleg a friend got me on a trip to Japan. That was about three years ago and the game is very similar to that, but some of the bosses have changed as well as the in between stage boards (of course, no loading time). I have not played the newest PS One release, but someone was telling me that it was just a port of this old Japanese release I had. So, if it is, the game is similiar, but there are some new things thrown in for good measure (like bosses, few new enemies, etc).
-Nick