From a technical perspective, yes, you are correct, it'll effectively become a C90 with two non-cisco display panels attached.
You may run in to some minor issues down the track with licences though, as your "C90" will be licenced as a "Profile 65" - someone will need to make a note of this if you need to add any additonal licencing in the furture. An example of this is the MultiSite licence, on a "Profile 65" it's LIC-P65-C90-MS, on a "normal C90" it'd be LIC-C90-MS - so depending on how your device is configured, a different licence is required.
I believe, through the TAC, you are able convert the device and the installed licencing to a normal "C90" - You can do it the other way with a T3, so you should be able to do it with a Profile - there's a document that refers to that process here: https://supportforums.cisco.com/document/9878051/replacing-t3-c90-codec-after-rma-shows-incorrect-product-id.
PS - Questions on these types of devices are more actively discussed in the TelePresence section of the forum rather than the Video over IP section you've posted it in.
Wayne
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Wayne
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