In the same stream where C. sp. 'Lingga 7' was found, my explorer friend found another patch of cryptocoryne just metres away which he termed as C. sp. 'Lingga 8'.
C. sp. 'Lingga 8' was different in terms of its leaves which were totally green both on the upper and under sides, and had reddish limb instead of yellowish one, see his blog for the photographs of the spathes.