Hey folk, I haven't been around for a while - sorry for this. Now that I'm back, I see some new articles have been made, well done! I have a question about them. I've just read the one about Korat cats, and now I wonder, what's the difference between the Russian Blue and Korat cat? They look so alike!
Welcome back, Lauren!
Russian Blue and Korat cats are similar indeed, but they do have differences. I'll try to make a table for you..
Moreover, the head structures of the two breeds are quite different and they also have very different personalities. You might have read about it in the articles.
Russian Blue cats
Korat cats
Russian Blue and Korat cats are similar indeed, but they do have differences. I'll try to make a table for you..
Sign | Russian Blue | Korat |
Coat | Double coat with dense undercoat | Single coat with nearly no undercoat |
Weight | Usual weight for cats of this size | Heavier than the Russian Blue |
Body type | Not very chunky; longer and straighter lines | Stockier and a bit chunkier; rounded lines |
Colour | Grey-blue, lighter than that of Korats | Gun-metal blue, a bit darker than the usual Russian Blue colour |
Eye colour | Emerald green | Peridot green (more yellowish) |
Nose | Straight in profile | With a slight stop in profile |
Moreover, the head structures of the two breeds are quite different and they also have very different personalities. You might have read about it in the articles.

Russian Blue cats
Korat cats
The Korat's head shape is very specific and described as "heart-like". This is the main sign to distinguish the two breeds, I guess.
As to their personality, Korats are more companionable while Russian Blue cats are more independent and less demanding. Russians can be let outside, which must not be done to Korats for their own safety's sake.
As to their personality, Korats are more companionable while Russian Blue cats are more independent and less demanding. Russians can be let outside, which must not be done to Korats for their own safety's sake.
Hi
I am a proud owner of (or, rather, am owned by) two Russian Blue cats and quite often I cannot easily spot a difference between Korat and Russian blues
As far as I understand the standard of Russian Blue breed in the UK is different from, say, US standard so I often confuse American RBs with Korats. Thanks for a detailed info, Ruslana! 



Comments
It's difficult to say without a photo. Considering it was only half-bred, anything is possible. Sometimes the Russian is pretty similar to the Korat but not the opposite.
A few more details about the head structure:
Russian Blues have longer faces and large, pointy ears. Korats have more foreshortened faces and smaller ears.