Which Luke and which Silo? Luke 2, EMG's. Silhouette is HSH, Luke 3 is HH or HSS. Silo Special is HSS, however you can get them used as SSS. And you can get Silhouette as a HH with a Floyd trem used as well.
The Luke has a V shape neck with low-profile frets. The Silhouette models have a modern C shape neck with medium jumbo frets. To me, the upper and lower bouts on the Silhouette's is a little more exhaggerated. Weight is similar.