Apparently there are "new" 6-digit postcodes (new to me anyway, not sure when they were introduced).
Just looked up my home one and it's quite different to the old 5-digit code.
There's a list (here https://en.youbianku.com/Cambodia) but has anyone seen a map? Trying to figure out codes for a few addresses.
New 6-digit postcodes
Lol, well at least I knew about Kids' City. I have just seen a website referring to the change happening in 2018. A lot of websites are stil linking to the old 5-digit codes, though.