The answer depends on how you add up the various sub sets of each type. Is Cessna172 just one ? or is it 172 S, 172 R and so on. And is the O-360 one type or is it injected or normally aspirated, different horse ratings etc as two or more..
Could maybe make a claim for the Dart if you allow 4 per Viscount and 2 per 748.
All in all I'd be inclined to the O-360 (assuming it's only one engine) when looking on here
Lycoming O-360 - Wikipedia