During the Championship England were able to boast the same seven backs that started each clash, while only Mako Vunipola, David Wilson and Ben Morgan were additional starters from the forwards that started the opening defeat to France.
But as Lancaster turns his attentions to next year's World Cup on home soil, the England head coach has reassured his troops that places are still up for grabs.
"What needs to happen now is, the combinations that we've got in place need to have consistent game time and we've got 15 games to go now," he said.
"I wouldn't say experimentation is over. There will still be opportunities for guys to come in, but you want them to go through the fire and learn together, and then take that learning into a World Cup.
"One thing that I've looked at - what it takes to win a World Cup - is obviously a previous tournament experience, because it's unique to play seven games in seven weeks.
"I think from my point of view, all of our players will never have been through that, by the nature of the fact they were not involved in 2011.
"We need to replicate that pressure and allow the players to experience it."