Yes, they also go on the Kraken. But you have to keep in mind that they are airflow-optimised fans, so you lose a lot of performance when you mount them on a radiator. I would recommend the SPF series for radiators.

Yes, why shouldn't they fit? They're only 120mm fans, so they'll fit in almost any case.

One connection per fan :)

Yes.

Normally yes. Unless you make something yourself so that it always lights up ;)

no you can't.

Nein, da dies ein 280 Radiator ist müssten es 140er Lüfter sein, also zB. Corsair Air Series SP140 Twin Pack (140mm) Corsair ML140 2er Pack (140mm)

no they can't, they ring brighter the faster they turn.

You would have to try it. I can't promise you that it will work with the brackets.

They would certainly fit, after all they are from the same company as the cooling itself. 140mm fans also have standardised holes. However, I would recommend others, namely a couple of NB Black Silent Pro PL2. They are cheaper, quieter and have a higher static pressure. For water cooling, this is usually more important than the pure air flow rate. What use is a lot of air without pressure?