These models are the same but with different branding model names depending on the part of the world they're located in.
I've been lucky enough to get some detailed input on the PX800FW thanks to Andrea so that's something I need to write up soon...
More as a note to myself for now but it seems the proof I needed re: the PX700F is now available here as the trapdoor is definitely absent which would indicate that the underside has the same arrangement as the 800...
Now, if only we could get our hands on a resetter.
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680