Hi! Please Tell Me The Equivilant Mgs Of Zoloft Needed

Hi! Please tell me the equivilant mgs of Zoloft needed to substitute for 20 mgs of Prozac. I am aware that these are 2 different meds, but I want to know how many mgs of Zoloft someone suffering from bipolar disorder, OCD, PTSD and general anxiety issues would have to take daily to achieve the same results/benefits that taking 20 mg Prozac provides. Thank you so much for taking the time 2 answer!