Front panel is different because the wood boards are different width. Bedside angle strips have a different hole pattern, placing the cross sills in different spots. Don't forget that 62 bed is made to fit a much wider frame spacing than your 56.
http://www.mar-k.com/bed_side_interchange_gm.html All your mounting points will be off. Also, the 62 bed sits about an inch higher than the 56. You will have to make some adjustments to get it to fit right and look 'authentic'.
Mar-Ktech
