User blog comment:MakeShift/Discussion on post-Crisis changes to the wiki/@comment-39280494-20200120065101

Spoilers for Supergirl 5x10 below!

Two things: the first is about Lena. When speaking with Lex, he reveals that he made a deal with the Monitor (hinted at in 5x08) for her to survive the Crisis. This implies that the Lena we saw this episode is Lena from Earth-38.

The second thing is that Alex tells Kara in the opening scene that J'onn restored HER memories - this furthers my (and many other's) belief that the Earth-Prime characters are their Earth-1/38/BL counterparts. Alex explicitly states that the memories given to her were her own.