You're correct IC17 are the tone oscillator. There are a minor difference for the snare module where the output low-pass filter (R120/C22) are not implemented.
You could measure and compare output of VCAs (IC9/IC10 CA3080 pin6) from a couple of module cards to check if the the OTA is defective. If you find you need to replace one of them this page might be of interest.
hans