There really is no difference but ones newer and the other isn't
according to "wikipedia", the J35A3 is the 3.5L SOHC VTEC V6 found in the 2005-2008 Acura RL, 2007-2008 Acura TL Type-S, and the 1st Generation Acura MDX. vs the J35A4 is the 3.5L SOHC VTEC V6 found in the 2002-2004 Honda Odyssey Minivan.
Just the year
it's just the decals i mean just the colors and Suzuki logo's
The 2008 Acura TL has 24 valves.
The 2008 Acura TSX has 16 valves.
The 2008 Acura RDX has 16 valves.
The 2008 Acura TL has a V6 engine.
The 2008 Acura MDX has a V6 engine.
The 2008 Acura MDX has 24 valves.
The 2008 Acura RDX has an inline 4 engine.
The 2008 Acura RDX is a gas-powered vehicle.
The 2008 Acura TL is a gas-powered vehicle.