Can I use a Microwave Capacitor as a Motor Start Capacitor?
Your original capacitor has a capacitance of between 50 microfarad and 60 microfarad (sometimes abbreviated confusingly to MFD): -



Your microwave capacitors are 0.95 uF and 0.76 uF respectively rendering them useless as a replacement for the original motor start capacitor.

Here's a link to Amazon where you can get a GENIE garage door opener replacement capacitor (apparently, if you believe what amazon say!).

Don't try running the motor without the correct capacitor or it might smoke a bit.