Ya, im having to agree as well after looking at the specs. The 4060 & 4760 are only different in HP & .2" of ground clearance (which I suspect might be an error). Definitely more spec differences between the 3560 & 4060 than be explained by bigger tires as I originally thought.DO the research. I didnt stare at the specs too hard but....
Everything I saw about the L4060 and L4760 were identical. Same tire size, same 3PH capacity, same length and width, nearly the same weight, same engine, etc etc.
The 3560 is shorter, a few hundred pounds lighter, smaller tires, and a 3 cylinder instead of a 4. I think your dealer was wrong to say the 4060 and 3560 were the same.
Definitely need to get some seat time in a L4060, maybe a L4760 now. The L3560 was definitely underpowered for my tastes, but also pushing as big as I'd like. I'm happy with my current 60" track, but the L3560s I've seen were set with a 72" or wider .