The Whirlpool fridge door mechanism is not reversible as it is not symmetrical and as such if you do not have the second set of parts you cant reverse the doors.
More is described in the video about the project here: https://youtu.be/kMSAlDK4Rs0
Technical
The part may be printable with a very well calibrated FDM printer, but I was not able to do it with one, it required a SLA printer, but a SLS or a DLP printer could also work.
The prototypes were made using FDM and SLA and the production part was made using SLS.