@SirTapTap Can confirm. In Sweden there has been two blocks, one on the left, which consists of the Social Democratic Party and it's allies/frenemies, and one on the right, consisting of anti-leftist forces.
The compositions of these blocs have, as you noted, stayed mostly the same. The most recent shake-up of the system was the Center party (former farmers' party turned neo-liberals) leaving the right bloc and being pretty much replaced by the nationalist (former nazi) Sweden Democrats