short answer, YES.
only in PPM mode, NOT HRS mode. HRS "high rate speed", is for digi servos only. You'll get a faster more accurate response out of your digi servos in HRS mode. however, HRS mode will kill your analog servos, even if you're only using one. You'd have to run all digi servos in order to use HRS mode on your 3pm, and you need to use HRS mode to get the most out of the digi servos.
Capeesh?