Why would DSM32 swap change extensions if I set Dip Switch the same?

[nooop]

So I had two MBM's changed under warranty. I powered down the system and installed them 1 at a time. The MBM's are DSM32 that are being removed, and the new ones say DSI on the front, but they are still 32 digital stations. I set dip switch's the same, and all users extensions are now on a new port and new extension that cause too much greif, so I put the old MBM back. So they must be different MBM's, and require different Dip Switch settings. Any ideas? I read all the notes, and I usually have no issues with Dip Switch's like this.

Thanks in advance

 

[nooop]

BCM400 3.7 on this, sorry to leave that out.

 

[gberger]

DSI mbm cannot use Double Density so they each take 2 bus which mean it cannot work.
You definitely need to get 2 DSM32+.