A court spokesman confirmed the UK women's guilty pleas but said they had not yet been sentenced, Sky News reported.
Both women have pleaded guilty to drugs trafficking.
It means they automatically benefit from a sixth off the minimum jail sentence of eight years and will be sentenced to six years and eight months in prison.
Sentencing has not taken place yet and a new hearing where the women will be sentenced has now got to be arranged.
But it's likely that will take place in around a week's time.
More top news
Marco Reus says even he doesn't know why he did not take a driving test after he was fined 540,000 euros for driving without a licence.
A ban on female soldiers fighting on the front line could be lifted in 2016, the Ministry of Defence has announced.
A woman who filmed her elderly mum's carer stealing money explained how she felt ill when she discovered the crime.