I don't think there is a simple answer to your question.
With these Korad's there seems to be two types of transformers. There is a 220V transformer that has a centre tap for 110V operation and a 240V transformer with no centre-tap so fixed 240V nominal operation.
From what I can see in the pictures that 110/220V unit has definitely got the new version boards. Plus it has a transformer labelled 220V. Those are the same boards as we received as replacements to upgrade our stock. If there are two transformers needed (especially one for 240V operation), then that would indicate that the regulator board does not like too high a supply voltage.
The Korad's tolerance on mains-voltage does not seem to be specified on any documentation we have so it is difficult to to pass comment on your question. All I can do is reiterate that if something is designed for 220V and here in Australia it can go to 253V and still be in tolerance, then I personally would not take the risk.
Here's an interesting bit of reading. The first paragraph 2.2.1 says it all........
http://users.metro2000.net/~purwinc/seec2_2.htm .
The supply voltages were "harmonised" around many countries in the 220V-240V world, however all they did was really change the tolerance. This allowed authorities to say 230V is the standard but power companies can continue using all their old 220V and 240V generation and distribution systems. The way the voltages are now specified, means all will be still compliant but manufacturers have to build to that requirement if they wish to send the same products to multiple markets. This does not seem to be the case with KORAD.
If you are in an old 220V country (now nominally 230V), and as you said Rick, your typical range is 215 to 235 then you haven't got a huge risk if you get the 110/220V version..... HOWEVER..... and here's the crucial issue, Korad needs two transformers depending on the destination. Why would they need to do this? Think about it because that's the $200 question....
So it's up to individual's choice to buy one with a 110/220V transformer and take the risk using it where the
TYPICAL voltage is >240V like in Australia and UK, (old 240V countries before "harmonisation"). All I can say is that if you are in an old 240V country and buy a 240V version then you also are probably OK.
The remaining question is "if you are in an old 220V country and you get a 240V version, (as you are suggesting Rick) will there be enough voltage from the mains supply, if it is at the low end of its tolerance (around 215V), to allow the power supply to deliver its full rated output voltage under full load....??"
I suddenly feel a variac moment approaching...... but not now as "beer o'clock" is only 4 minutes away...