the "rubin" is the shorter, large-leafed red/pinkish plant and "red" is the to the left.
med/high light, co2 and consistent fert dosing.
I certainly agree the one on the left is L. sp 'Red' and the one on the right is certainly different. The L. sp 'Rubin' in your picture looks somewhat like the one pictured at APC
although not as reddish, the leaves seem longer, and I cannot quite make out the detail of the leaf placement on the stems.
Thanks for the pic....worth a thousand words!