As far as I can tell, all of the models listed above are interchangable as far as the motherboard is concerned, for the most part. The one exception seems to be those models of the Optiplex 7440/7450 which include a 2K/4K display, which use an embedded displayport header that is unpopulated or not even present on motherboards that don’t use it, in favor of an LVDS connector.
I have swapped an Optiplex 7450 motherboard (with the R7 M465x dedicated GPU) into an Optiplex 5250, and it has been working perfectly fine. I did this because the 7440/7450 motherboards have an HDMI input, so I can use it as a monitor. This has worked perfectly fine. You would likely need to swap out the power supply for the 200W model though - this is relatively expensive, but I’m using an i5-6500T, which offsets ~30W of the power draw, in my mind. I haven’t experienced any errors or instability that I could trace back to having the improper PSU.
For touchscreen models, the touch is implemented over USB, with a 5 pin header - 1.5mm pin spacing on the board connector, and a different spacing (1.25mm?) on the touch board itself. Importantly, the touch digitizer runs on 3.3V and the on board header for the touch outputs 3.3v. Also, the cable colors are not indicative of the pinout. I’d like to eventually give this some sort of external output capability - I am thinking of getting a TS3USB221 board to test this out - I bought an extra cable, and I’ll probably cut it and resolder the power & ground connection only, connect the data lines to a USB-A cable and see if it works fine that way as an external touchscreen.
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