Well, here are my ideas.
See the pdf document from 4d, mentioned in my first post.
In this document, goto page 8 and study the table with the MPU transfer modes.
There are some modes which do not need all data lines. So at least it matches the fact that some
data lines are missing on your board.
If your module as a OTM3225 display controller, that somehow the interface mode must be selected (IM0..3 from page 8 ). Since these lines are not part of your interface, then these lines could be hard wired on the board.
says that 8080 16 bit mode is selected. This would match the missing DB9 line, but will leave a the question about the DB8 line (maybe your initial information is wrong and DB0..7 should be labeled DB1..8 ).
On page 11 of the controller pdf the 8080 16 bit mode is explained in more detail. Indeed DB1..8 are internally mapped to CB0..7, so maybe the module developer has simplified the interface description.
I would do the following:
1) reset the module on pin 23
2) write 0 to the index register
(see datasheet, but should be something like CS = 0, RS = 0, RD=1, DBx = 0, low impuls on WR)
3) read the device id
the returned number should 0x09324, so you might see 0x93 or 0x24 on the lower 8 bit bus.
If this is the case, you have a OTM3225 display.