ATV weights

I am shopping for my first ATV.

One of the things I’ve been amazed at is the difference in reported weight for different ATVS.

Example:

2016 Yamaha Grizzly 700 SE – 692 wet (so around 665 dry?).

2016 Arctic Cat Alterra 700 (single cylinder 700 engine w power steering). Dry weight is 750 pounds!

Why are Yamaha ATVs so much lighter? I get the Can Ams will be heavier because they are twins.

Any thoughts? Thanks.