Hello, I have recently come to own a Chicago coin hi score pool, doing some digging I noticed my game is somewhat different than the ones pictured. Hoping a knowledgeable pinsider can shed some light on what the differences mean if anything?

My machine has the full add a ball mechanicals
The difference is mine does not have rebound contacts and lights as well as the playfield art for the rebound contact area. Instead I have just blanks on the playfield, and a wooden block that covers the area spanning the rebound rubber area. The other games pictures show plastic posts in this area. This is my game. IMG_1324 (resized).png

Only game I found same playfield art as mine has “Chicago model” where the others have just the CDI logo. IMG_1323 (resized).png

Any ideas or insights as to why the differences are as they are?

IMG_1318 (resized).png