Class B int.=Class B Pre/Pro???

Good question. My guess would be sometimes yes, sometimes no, depending on how well the two components integrate,you should pardon the pun. The tradeoff between a shorter, cleaner signal path(for integrateds), versus the superior isolation(in most cases) of separates, makes it hard to generalize. I can easily picture the sum being greater or lesser than it's parts.

I would think that a class B int. could sound better than the separates if a poor cable linked the two.

Class B seperates will almost always be sonically superior to class B integrates, but only if they are properly matched with the right synergistic components. Be very careful with Stereophile recommended components. They should ONLY be used as a guideline. Stereophile can be very political thus are there ratings on components.