Difference between BusBoard BB830 and BB830M breadboards?

There are two 830-point breadboards from BusBoard on DigiKey: BB830 and BB830M. How do they differ?

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These two look to be identical. I did not find out what the call out of the M means as the data sheet only mentions the T suffix for the transparent color… BPS-DAT-(BB830)-Datasheet.pdf (busboard.com) and their website for BB830 | Solderless Plug-in BreadBoard | BusBoard Prototype Systems also does not mention the M suffix.

At this point, this is a guess on my part, but from their datasheet, it states the following:

From page 2 of the datasheet:

I suspect the β€œM” refers to the optional metal backplate.

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