Looking at your old thread Igor it looks as though your just about to close up. I'm not sure of the thinking on this one from the other judges but to me it's not about how quick you finish a model, we give no points for that. From a judging point it's more about the finished product as well as enjoying the fun of your build, the ideas gleaned or information given while building.
From me, I would think it's okay for you to transfer your info from the GB11 to GB13 and continue with the build. But that's only my thought, so best wait to see what the others say.