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AM62A7: Why recommended stack-up for routing the DDR interface is different with AM62x's?

Part Number: AM62A7

Hello TI Expert

In SPRAD66, Unit 1.3 PCB Stack-Up :The recommended stack-up for routing the DDR interface is a ten or twelve layer stack up.

But in SPRAD06,Unit 1.3 PCB Stack-Up :The minimum stack-up for routing the DDR interface is a six-layer stack up.

My question would be whether AM62A7 has different DDR PHY design compare with AM62x series?

What's lead to different stack-up recommendation from SOC side view?

BR Jingcheng