Agreed, that the spikes smooth out over age. But in this case. the tree posted with spikes in its trunk has a trunk girth - double than that of the tree without spikes.
Agreed, that the spikes smooth out over age.
But please note, the tree posted without spikes (this mail chain ) has a girth - half the size of the tree with spikes (emailed later) the cotton seed color again differs.
Completely agree with Barry.A detailed description of leaves(rather than only the picture) may be helpful,in absence of flowers,which in both these trees would have finished long back
Another differentiation is distincly green bark in Ceiba speciosa and C. insignis(both of which have thorny barks)