This is the same art as in the tankoubon and on Futabanet (and Niconico Seiga)
It originally launched online on the 27th October 2017 on Monster Comics:
https://twitter.com/monster_futaba/status/923746449799593984
https://web.archive.org/web/20171102050637/https://webaction.jp/Mcomics/
The mangaka is the same, but with Monster Comics moving from webaction to Futabanet the old read links are dead so I can’t say for certain there wasn’t any redrawing. The version on NicoNico Seiga was first added on the 26th April 2018, and I can’t account for the delay from the Monster Comics serialisation, unless there simply was a delaying in adding it to NNS.