The pofo looks similar. Slots have changed. Character IDs seem to be for the most part the same too. You can still load NPCs. Some work, one froze my computer. I'd imagine the arena IDs are similar.
**As of March 23rd, 2023 the pofo has been almost completely mapped out, thanks to Nyan4Krunex his findings are in the main data thread, WWE 2K23 Data Breakdown and Analysis
SUPER POFO 2K23-
Full, including CAW slots and Cheatengine Header- https://drive.google.com/file/d/14Mrebqk_3TDVSZDVrAIcBZmALQE0R_ek/view
Trimmed, omits CAW area, Superstars only starts at first byte of the rock (slot 100) - https://drive.google.com/file/d/1eetsdPeYMir6pDig65-nbA-kTvMR_ipC/view
Starts at the beginningt of Rock's pofo (slot100) 64 00 64 00 1A 01 00 10 00 00 C6 24 9F 71 E7 09
Superstar pofo data seperated into slots, one file for each superstar - https://www.mediafire.com/file/7n3t2ibvd5a5dpq/WWE_2K23_(Pofos).rar/file
Thanks @SYCOGRIM07
Pofo trimmed to superstars only, with all characters unlocked- https://drive.google.com/file/d/1uxHB2ytp_E2WzrHcoaFg9wuz6vjytWqE/view
Load this at the address where the above starts to unlock all characters in the game, including NPCs.
Some work, some don't. They can all be forced with character ID at the select screen. some will crash the game.
Useful resources-
Confirmed data will be posted here: https://smacktalks.org/forums/topic/79304-wwe-2k23-data-breakdown-and-analysis/
Character ID list https://drive.google.com/file/d/11dTewNf8H5ruWH7Ifbqw-4XqMMvjSiIK/view
2k22, not 2k23 character ID spreadsheet - https://docs.google.com/spreadsheets/d/1t2UK5qzkw8qqJhV1ZD7U61VYCJThjswcxw4c4YJH3I4/
NOTICE: In this thread, we're discussing mods via live memory edits. I've had no trouble tinkering, but If you care about your saves, and are the least bit concerned, back them up. Also I don't know what 2k's policy on any of these mods are, so If you use a modded save online, you do so at your own peril.