two credits

https://www.imdb.com/title/tt2320924/

this tile has two "Robert Middleton" for the same role

https://www.imdb.com/name/nm3922830/?ref_=tt_cl_t_14

https://www.imdb.com/name/nm1205037/?ref_=tt_cl_t_13

i struggle to find any information which is which and who actually belongs here