Col, the issue for those of us who work with Cat information is that to provide accurate answers requires a Serial Number, just like if you went into a car dealership for model-specific parts they'd ask you for a VIN Number.
Cat build machines all over and for any given model year there may be three or four different Serial Number prefixes on the go at the same time, each one produced in a different factory. I looked in the system for 232D and found five different prefixes. Now the information for all five might be the same but I wouldn't put my hand on my heart and guarantee it.
From your post above I think I can see what the issue might be. It would appear that your machine does not have the optional Pattern Change switch (it's an extra - what Cat refers to as an Attachment) installed. So what it appears to me as though the dealer is quoting you is not simply to change the control pattern, it's installing the necessary parts and changing the software in the machine control to enable you to change the pattern using Switch #11 in the illustration below any time you want to. A slightly different scenario.
What you are experiencing is a bug bear of mine from when I worked in the dealer world. The whole thing about the pattern changer (and all the other available Attachments) should have been brought up to you by the Sales people BEFORE you placed the order to buy the machine, so that what you bought was what you needed.