Both cases have similar pattern in terms of wandering off for me, but they are not quite the same. Reading for joy means enjoying the products of your own imagination, but sometimes it shoots over the line, I guess. Reading for work is more tedious, because its not for fun, hence the guessing distraction, like "yeah, I get it, but what about this and that?" Having understood the problem, reading the solutions then seems kinda obvious.
There is a difference, but both follow the same pattern, so: yeah.