Theoretically, that's true, but historically, ZB and ZN have moved nearly in sync, with ZB moving about 1.5 times more than ZN due to the extra duration. Only this year have you seen significant divergences from ZN and ZB, with ZB outperforming by a lot over ZN. A sharp flattening of the yield curve while short rates are at zero is unprecedented.
I don't know your definition of "moved quite nicely" but both did have equal number of volatility spikes on Friday. The main difference was that one was able to make new highs in comparison to Thursday prices and the other was not...nothing unusual about that (happens several times every month involving highs or lows).