yes. That particular series was the 73, 106, 107, 126, 127 and 147. The differences being 73= gear drive 3 speed 1 reverse 7 HP motor. 106=10 horse 3 speed gear drive. 107= 10 HP Hydrostatic drive. 126= 12 horse 3 speed gear drive. 127= 12 hp Hydrostatic drive. 147= 14 HP hydrostatic drive. Note; no 14 HP gear drive was available in this series, and the 147 has a gusseted frame to accommodate the larger flywheel. The 73 through 127 basically used the same frame. The hood and lack of fender pan/fiberglass dash set the 73 apart from the rest. It also was the only model in that series to have a hood ornament and the last until the red ones came out.
I'm enjoying the 73 thus far in that it's like a 1/4 scale version of the 147 I already have even though many of the components are the same. (front end piece, front axle, etc). It's such a size difference between a 7HP and a 14 HP motor.