a nice twist!

I've seen quite a few where this happens, actually. I can recommend a few if you like!

so far i know only two!
so yes please, spare recommendations ma'am

You got it! To start off with there's:
http://www.mangago.zone/read-manga/jishou_akuyaku_reijou_na_konyakusha_no_kansatsu_kiroku/ (which has the classic MC-villainess-roll-swap)
http://www.mangago.zone/read-manga/i_m_a_villainous_daughter_so_i_m_going_to_keep_the_last_boss/ (which has the in-universe otome mc as ALARMINGLY evil)
http://www.mangago.zone/read-manga/this_time_i_will_definitely_be_happy/ (just telling you that anyone else gets reincarnated in this is huge spoilers. VERY GOOD story tho)
http://www.mangago.zone/read-manga/the_villiainess_is_adored_by_the_crown_prince_of_the_neighboring_kingdom/ (from what I can remember, so far it's only *implied* that the in-universe otome mc is a reincarnator, but it's implied *very* *heavily*.)
http://www.mangago.zone/read-manga/the_prince_was_my_lover_who_threw_me_away_in_my_previous_life/ (exactly what it says on the tin)
http://www.mangago.zone/read-manga/ryuubi_tokuko_wa_shizuka_ni_kurashitai/ (this is a weird one just gonna go ahead and warn you)
http://www.mangago.zone/read-manga/i_am_troubled_that_my_fiance_is_a_villain/ (hooo boy this one's a complicated one. Reincarnation is surprisingly common in this one though.)
http://www.mangago.zone/read-manga/i_m_thinking_of_quitting_the_villainess_entourage/ (Otome MC isn't *evil* so much as really, *really* self-centered. and kind of crazy.)
and finally:
http://www.mangago.zone/read-manga/it_s_virtually_impossible_to_make_this_boy_like_me/ (just finished this one and it's really good! The otome mc isn't evil for once!!!)

!!!!!!
i didnt expect 'i am troubled my fiance is a villain' to have other people who knows theyre reincarnated except for the main girl :O
also, ive read "villainess adored by neighboring kingdom' and that manga is sweet as hell.
thank you for recs!!!!!!!!

“The Villiainess Is Adored by the Crown Prince of the Neighboring Kingdom”

(Manga recommendation with two people with past memories)