I took a look at the vanguard engine site, and the 16 and 18 HP specs I saw there show a different bore and stroke between the engines, so I don't think they will interchange. This was just a 2 minute search, so don't take it as gospel, maybe look a bit further yourself or contact them with the serial numbers from both engines.
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1864 w/48" deck, 2084 w/54" deck + 54" blade, 3204 w/48" deck
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