A hand flush can be 4 or 5 cards. Crib flush is only 5 cards. In pegging 6 7 8 equals 8 6 7 or 7 8 6 etc

Thanks for your help I appreciate it.

Yes to the first two questions.
I think a flush applies to both hand and crib, but not certain

Am hoping someone can help clear up a bit of confusion about this.
(Each possible combination of cards whose sum of values is 15) Does this mean if you held in your hand, for example, a 2, 3 and king this would count as 15?
(A run of three or more cards) Does this mean if you held in your hand, for example a 6, 7 and 8 this would count even though they were not played close together?
(All four cards are of the same suit) Does this refer to the cards in your hand or only the cards in the crib?

Came across this whilst looking for rules for 5&3 dominoes.
The rules appear exactly the same as normal cribbage, it is just played with a pack of dominoes instead of cards.

I think it would be an interesting variant. Maybe with double 6, 9 & 12s as options.
http://www.domino-play.com/Games/DominoCribbage.htm

The question remains, is it a cribbage or domino variant?

A crib flush must be 5 cards

I've played nearly 2000 games of Cribbage on here, I must have had it at least once. The odds are about 1 in 1000 when looking at the maths. Allowing for multiple cribs per game, statistically I'd expect about 4 in my time here.
I suspect the real odds are actually lower because some players won't put two of the same suit in to the opponent's crib.