Yes the two seem similar from the photos. But is Stein's Pillar also basalt? Anyway I should do a new google research on the climb of Roque Nublo. I was somewhat disappointed with what I got as return earlier this year. It's the national landmark of Gran Canaria and a very popular climbing destination so there must be more.
The routes appear to be heavily bolted. The guy we saw (and cheered) climbing found a bolt every 5 ft. They seemed to be new and solid. Anyway - he cheated - used the bolts to draw himself up. Spaniards! ;-))
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe