Are Suzuki ls 650 engine the same as Suzuki dr 650 engine?

I am told by mechanics that the two engines have many parts in common. "Too many to list" was the reply I got. I am not sure which parts are NOT the same though(?) Try comparing microfiches at OEM parts dealers online. A comparison of Suzuki part numbers will help. Note: the DR650 has a chain final drive, the LS650 is belt driven, so at least some of them are NOT identical. Hope this helps!