They don't look the same, there are several versions of them, so I can't really tell you what they look like, usually it is a white stamp with a colourful picture (usually a flower or a horoscope sign, but as I said, it could be anything) on it and the number 17 K? and there's written: ?eská republika.
As for Austrian stamps, I was last buying them a year ago, so I hope their price didn't increase, but for sending a letter up to 20 gramps to Europe you need a 65 cents stamp. That should be also the same value of the stamp that is equal to one IRC. The ones I bought were yellow and had a flower on them and number 65c and there's Österreich written on them.
Hope this helped
