The color will be different yes, but the flavors are also very different. Think of it this way, the barley has been malted for longer periods of time to increase the lovibond rating. On the lighter end of the scale (20L) you will get a much sweeter, candy like flavor from your malt; when you get into the longer roasts (120L) you will get richer, roastier flavors from your malt.
Bottles: SMaSH Maris/Citra, Munich Dunkel, Independence Day Imperial Stout, Cascadian Dark Ale, Surly Bender Clone
Primary: LFA Lime
Secondary: Bells Two Heated clone
The Canning Room Brewery