This sounds like management outsourced their micro-management.
Even in a fully cross-functional team sprint planning is deeply personal. Not only because my skill set is personal but because my commitment to time estimates/scope of work is personal.
Show me some other teams estimates and I'll close my eyes. I don't even want to know until I've reasoned through what my team can do.
I'd welcome this data in a retrospective when we're trying to improve the process. Just as I welcome the discussion about differing point bids. But I completely reject it as directly useful work. I simply have to do this myself or I'm flat out lying when I commit to being done in a sprint.
If you do this, you don't really have two teams. You have one team. Half of which never meets with the other half.