Costume Tree in Costume Biom

I would add costume tree because i would make a Winter mod and i create a new log and leaves.i would use the big Taiga structure in Costume trees but there automaticli Set the Spruce log and leaves. I would use the big Taiga structure and my costume blocks. How? Because i create trees and save them as structure and generate them in my bioms like trees but the spawning is not optimal and i like the big Taiga trees more then my and now i would aks: How can i use the big Taiga tree structure with my blocks. Edit the Code in Code Editor ore is there an easyer way?