I think this is a great idea, pretty much the only way to learn what things affect our beers the most. Reading about brewing is one thing but hands on experience is hard to beat.
I was trying something like this to find out what some hop flavours are, being new to home brewing. Flavours and smells are nearly impossible to describe in words IMO.
I did 2 Morgans Blue Mountain Lager kits. One with just brew sugars(Dex, DME, Maltodextrin). The other with 1.5kg liquid malt and 12g Pride of Ringwood hops. Well the difference was obvious, the liquid malt one was darker with bigger body and taste! After reading this thread I see there are many more factors which may also have affected the outcome... Spliting a wort in 2 may be better.
Brewtus,
Do you remember the differences in your dry hopped/non dry hopped lagers?
Mick.