Before the change:
LL has a 3nm spacing requirement, which is the same as the minimum radar separation, which can decrease to 2.5nm when certain conditions (daylight only, and good weather conditions etc) exist.
After the change:
LL still has a 3nm spacing requirement, but now the minimum radar separation is 2.5nm on final approach, bringing LL into line with ICAO guidelines on radar separation on final approach.