Hikvision is really cracking down on their supply chain to curb gray market cameras sales. From what I have read, Hikvision used to only have one model number for each camera type sold. DS-2CD2132F for example, but region code and serial numbers were different depending on the market. WR in the serial number for Western Region and CH for China for example. Now it appears XXX2 model numbers are for Western Region and XXX5 is specific to China. I'm assuming with Hikvision cracking down on gray market cameras, XXX2 models are now exclusive to Western Region and more expense and or harder for unauthorized Chinese resellers to get. Therefore you are seeing XXX5 cameras offered as "their" replacement to the XXX2.
I actually have (2) XXX5 cameras. The first I bought on Amazon. I purchased a DS‑2CD2332 but was shipped a DS‑2CD2335 and was also told it was the 2332 replacement. I objected and offered a $15 refund to keep it. The other I bought on Ebay knowing full well it was a 2335.
Another thing I have read and I'm a little more concerned about is newer NVR firmware and IVMS will do a model / region check and if it's not a western region camera you will get a "Language Version Mismatch" and it won't connect. You could still connect it as a generic ONVIF but would lose a lot of functionality. If that is in fact the case, I will need to replace my (2) xxx5 cameras if I want to upgrade my NVR firmware.