Is there any proof that they were reincreated as a "new characters" but wasnt revived by Oliver rebirthing and mixing Earth-1 / 38 / BL?
I don't think that Barry and the others were just been put inside a new earth to continue their life there. There has to be some surprises.
I think Clark and all the others such as Alex, Iris and everyone else were just brought back from death instead of being created with different memories in another timeline.