The action pins on the 201 are not the same as the 23, and do match the Parker Reproduction action.
But they are different guns

201

[Linked Image from photos.smugmug.com]

Parker Reproductions

[Linked Image from photos.smugmug.com]

201

[Linked Image from photos.smugmug.com]

Parker Reproductions

[Linked Image from photos.smugmug.com]

I don't know if Skip the Snipe guy is still around, but he went through this with a 201 and might help
https://www.tapatalk.com/groups/thesnipehuntersforum/classic-doubles-a-mystery-t4150.html