YUSUFALI: And those who launch a charge against chaste women, and produce not four witnesses (to support their allegations),- flog them with eighty stripes; and reject their evidence ever after: for such men are wicked transgressors;-
PICKTHAL: And those who accuse honourable women but bring not four witnesses, scourge them (with) eighty stripes and never (afterward) accept their testimony - They indeed are evil-doers -
SHAKIR: And those who accuse free women then do not bring four witnesses, flog them, (giving) eighty stripes, and do not admit any evidence from them ever; and these it is that are the transgressors,
If you accuse a woman falsely of being a fornicatress or an adulteress for which she would be punished with 100 lashes if found guilty, then you would receive 80 lashes.
The converse would apply to women who falsely accuse men of rape.
If his punishment is 1000 lashes if convicted of rape, then she would get 800 lashes.
If his punishment would be to pay her £10,000 in compensation for personal injury if it were established that he did rape her, she would have to pay him £8,000 if it were later established that her rape accusation was false. Sorted.