Pretty unlikely that the Bolsheviks supplied them to the Emir to fight the British in the Third Afghan War. For starters, the First Polish Tank Regiment wasn't formed until May of 1919, didn't receive its tanks until June and didn't see action until August, after the Third Afghan War was over. An opportunity to capture said tanks, wouldn't really arise until almost a year after the end of the Third Afghan War.
I wonder where the Afghans got spare parts from, if indeed they received them at all.