same show has two pages?

Are these not the same series, with slightly different titles?

Sanditon: https://www.imdb.com/title/tt8685324/?ref_=ttep_ep_tt

Sanditon on Masterpiece: https://www.imdb.com/title/tt15739384/?ref_=ttep_ep_tt

Main cast and episode dates are all the same. The latter page is not fully developed: cast & crew and other sections are missing, and episode guide is incomplete apart from dates.