There were lots of changes to front forks over the years but the steering head was the same for all years. Some LC4's had oil in the front downtube and some didn't. Also some LC4's had counter-balancers and some didn't. Those with counter-balancers have more clearance at the front of the frame. I believe all oil-in-frame LC4's were counter-balanced, so that should indicate more front clearance.
Somewhere around 2000 there was a change in bottom frame rails, I believe from round tube to square tube (?). Engine mounting points remained the same though.
Rear suspension mounting points were the same for all years. Some supermoto models had a wider swingarm for a 5" rear tire.