At the same time, stamps with the overprints of other postal districts were distributed in Podillia for normal use. Of course, philatelists also brought Tridents of other districts to the counters of Podillian post offices for cancelling. But with that I am not concerned.
Basing myself on a quite small collection of Podillia postmarks, I find Tridents from other Districts used as follows [ I transliterate from the Russian language postmarks, none of which were modified in this period]:
List last updated 13 March 2013
Used at Mogilev [illustrated on my Blog of 8 January 2013]
Used at Vapniarka, Proskurov, Smotrich [ example below from March 1920],