I am looking for tall-growing pyracanthas, (at least 8 feet tall) with deep red berries (as opposed to orange, yellow-orange, or even red-orange)

I have seen great variation in the color of the berries within the singular variety: graberi (from orange, red-range to red).

I was told that in colder climates, the berry becomes a deeper red. However I took a couple of plants home (we live in a considerably colder climate and have not noticed any darkening of the berries in a few weeks)

I am curious if there are different cultivars within the same variety?

Thank you...Lori