if I had to guess - the tower cs35mg is the hitec 225mg relabeled. Most of the Hobbico servos are relabeled versions of Hitec servos. Many of the Tower servos are relabeled Futaba servos. Same with the Hobbico and Tower receivers - they are all relabeled Futaba units. The Hobbicos are really good values there because they include a crystal for less than the Futaba rx costs alone.