Hi, Rob.
That's the touch panel - the part you see (or, rather, those are the panels, the parts you see). In addition to it there is also a different control module behind the panel (likely in the cabinet behind, hidden behind a wall panel) that you'd also need. This is the brains of the operation - that the tank sensors connect to, which (1) broadcasts to the app via bluetooth, and (2) lights up the appropriate level on the touchpanel. I believe the touch panel you like is part of the X series of OneControl touchpads, and the control module is either an X180T or X260. Important: I DON'T KNOW this for certain, so make sure you do your own research if you're planning on doing some replacing.
OneControl is Lippert's name for a family of integrated systems, they slowly add new features to different levels (including all manner of data input points, like tire pressure monitors and propane weight sensors, fan switches, etc) based on what the control module will handle. Again, this includes all manner of connections for all manner of systems, some of which are not present on your 233. Like the other slides (that you don't have switches for on your panel, but you have room for them), or a leveling system (which you don't have on your 233), etc etc... You can do some google/youtube searches which turn up all manner of these systems.
Note that Lippert either purchases suppliers/companies that they want, OR have products white labeled for them. I believe WERV falls into this category. With my 2022, everything was branded WERV (and that's the main app I use), but OneControl will also work (with a slightly different/more updated interface on the app.. although in the past, the OneControl app was THE SAME as the WERV app, just branded differently).
So, long and the short of it is that the control panel that you currently have doesn't have a sender unit for the tank levels. Before you get excited, the newer panel uses the same sensors and idiot light system that are reported at the touchpanel, so you're getting a percentage, but that's still 100/66/33/0 (corresponding with the four Full, 2/3, 1/3, 0/3 lights). In that instance – and since (1) the tank level point sensor system isn't all that accurate, especially in a book-shapes water tank like our Roos' and (2) they aren't all that well calibrated, I don't put a lot of stock in them. With that limitation, it's not worth the headache, imho, but the heart wants what the heart wants.
Like the SeeLevel - MUCH better system for monitoring tankage (with their tape sensors, instead of Point sensors), but SeeLevel doesn't integrate with the OneControl you have. It DOES integrate with you Victron GX, as does a whole host of other sensors. But the point level sensors in the tank are the SAME, unit to unit. There's no plug-and-play function to get SeeLevel data into the OneController, and report in % fill.
Just my .02 I hope this helps. I could be - and often am - wrong.