I am very weary when people tell me that they need linen for a super king bed. I have in the past manufactured to these specifications and the fitted sheets, mattress protectors and base covers have been too big.
I do however recommend that you use a super king duvet cover and inner on a king size bed.
Most of the time when people refer to a "Super King" they actually mean King Size - Extra Depth and Extra Length.
The only time that a Super King would actually be a super king is when two 3/4 beds are combined, or if a bed has been specially made.
If two single beds are combined the make a king size bed.
So here are the correct measurements.
King Standard = 182cm wide x 190cm long x depth -This may vary from bed to bed but generally they would be between 25cm to 30cm deep.
King Extra Length = 182cm wide x 200cm long. Same applies to the depth.
Super King Standard = 214cm wide x 190cm long. Same applies to the depth.
Super King Extra Length = 214cm wide x 200cm long. Same applies to the depth.