In principle I think that any aviation piston engine block (with the obvious exception of Diesels, like Thielert) should be able to run on any gasoline fuel, be it mogas, mogas with alcohol/ethanol added, 100LL, 100 or any of the older aviation fuels.
The block isnt the main problem, it is the piston crown, valve inserts and cylinder head which can be harmed by differing grades of fuel and in particular possible alcohol content in mogas which can also attack seals etc.
Mogas isnt monitored or tested to the same standards as Avgas and its vapourisation rate can increase carb icing problems and fuel pump problems.
CAA Air Safety Sense lealet no 4 should be read before using mogas