Backwards, Joey. Say you've got D and G strings in a nice set which have nearly identical tensions at normal tuning; same construction, and the D is heavier gauge. Tune the D up to G, and it's going to be tighter.
As long as we're on the subject of strings again, I'll put in my vote for Thomastiks (Jazz flats are my choice, though the jazz rounds were also excellent; not interested enough to try the PowerBass line).
In fact (true story), my first experience with these strings, a little over a year ago, is what inspired me to start looking for a new bass. My Alembic is being built specifically so that these strings will fit on my 35 scale (we had to move the tailpiece a little).