help me ID two, maybe four types of comfrey?

The first picture is earliest to bloom and my favorite color.
It's fairly low growing with smaller narrower leaves than the other...I think it was called Russian comfrey by the person who gave it to me but I've never been sure..

The second photo is some from seed, 'symphytum officinale' bought from Richters.
It I am certain of except that I already had a similar growing one with similar colored flowers that I think is intermingling in some planting areas...not pollinating since that one is sterile even though the common has viable seed.
Will add photos as they flower.

The third photo is a clumping type and It will have pinkish flowers.
I shared it years ago at a plant swap and lost mine when we moved so have been able to get some plants from our son who I shared with originally.   I've never known it's name?

I  realize flowers are probably key to ID...should be more blooming soon as they are budding up.

This is comfrey type #4 of my photos.

This is the one I've had the longest (40yrs+) but has similar growth and flower color to #2.
It is in a spot where I would not have put the viable seed one....I think.

any guesses as to varieties?

It probably doesn't matter all that much except I thought I might try to sell some and then I would need to be more certain whats what.

common comfrey #2 flowering.
from seed, 'symphytum officinale'

#2, #1, #4.

2 is a paler version of 4.

adding this link to read later https://permies.com/t/15627/Comfrey-Varieties