If they are field replaceable, the answer is yes. It's really easy to do. If they are not then you can either send them in for conversion (2 pin to 1 pin is free I *think*) or just use them as is carefuly stowing the extra cutter.
Note if they are Cypres 2 units, I am pretty sure Cypres 1 field replaceable cutters may still be used, but will not be "waterproof"
I just got an e-mail from Kai Koerner, replacement is free of charge, they keep your old cutters and provide you with new ones.
The value bit is open for personal interpretation, if you see a 2nd hand cypres with a guillotine 2 much or 2 few and Airtec replaces it for you so you can use it, you have a good deal. I think it's excellent customer support.
And now for the shamefull bit, both units are 1-pin after all so there was no need for panic! This thread was educational anyway! Thx for the rapid responses.