Hi Steve,

you can look for the KSO ROM easily:

Open the cover on the left for the figures.
Then you can open (slide to side) the cover over the red letters Turbostar 432, in the Wiki are some pictures.
Under the cover is a socket for the KSO ROM, if the socket is filled then you have KSO, if not you can try to get a ROM and put it in.

The difference ist not so important, maybe 15-20 Elos for better openings.
In most cases the normal opening book is good enough...

Regards,
Achim