I went the other way.. No difference in the flange. No adapt-a-kit needed with one small exception
The Fresh water side the hookup is different... How I modified mine
Added a shut off valve (1/2 inch IPT to compression fitting)
Used a flex hose (1/2 inch one end. Compression fitting the other matching valve)
now I can shut off the water to the toilet without shuting off entire RV if there is a problem (Yippie)
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times