I think the entire pink plant is crypt flamingo - no clue if it is related to jacboansii. Well currently all are growing in a low tech tank - the 40B they were in did have co2; but i moved sept 15 so no co2 since then and they seem to be growing quite fine; having said that i do have very expensive strong light on them and i think that helps even though they have no co2. I was kind of thinking about it and you know our lights are nothing like the sun but then again i dont' really have a good understanding when algae kick in and in some of my aquariums i do get algae but no algae in that aquarium yet. I don't consider 2 1/2 months really long enough to consider it 'stablized' but if it keeps at this pace another 4 months i definitely won't be adding co2.I had a baby "jacobsenii pink" until my plant grow out tank had a melt down (sniffle, not sure why). It looked pretty much like your "pink" but I've also seen it look entirely uniformly pink, no hash marks or shading. I have some?? C. nurii variations. Not sure what they are or what their ancestry is...maybe "mutated" or (possibly) something else...I'm not the worst in my club keeping up with names.
Now you have to say why I might be sad...I'm betting I can't grow your green & white striped crypt...is that it? It's spectacular!
Since I don't do co2 (& I think maybe you don't either? I forget) many plants look different sometimes. (shrug) as long as they look good to me I'm happy...
I talked to someone who sells the plant with white line since mine hasn't propagated (yet?) and he said it usually takes 8 to 14 months and propagation is very very slow. I've had that one for about 18 months but it was heavily abused in the 40B completely buried by other plants (very little light) and i'm kind of amazed it was still alive - in this new aquarium i made it a priority to put it somewhere where it wouldn't be covered since it is such a lovely plant and it has shown good growth the past 2 months so i have high hopes for it overall.
Oh i have no problem sending you some pink jacboansii if you want some just have to wait till it warms up and you have to remind me. For better or worse that plant is worse plant i have in terms of over growing (a kind of way of saying it spreads like a weed).