I just noticed the Intel ARK sheet for Core Ultra 7 265U says the lithography is "Intel 3" :
www.intel.com
Which compares to the 285K saying "TSMC N3B":
www.intel.com
(Also: 110C max for Intel 3 vs 105C for N3B, The Intel 3 die is a 2+8 core style vs up to 8+16 for N3B)
..
At one point there were indications that Arrow Lake would have some chips on 20A.. but it looks like instead of using TSMC for all of Arrow Lake, they are using Intel 3.
Intel® Core™ Ultra 7 Processor 255U (12M Cache, up to 5.20 GHz) - Product Specifications | Intel
Intel® Core™ Ultra 7 Processor 255U (12M Cache, up to 5.20 GHz) quick reference with specifications, features, and technologies.

Which compares to the 285K saying "TSMC N3B":
Intel® Core™ Ultra 9 Processor 285K (36M Cache, up to 5.70 GHz) - Product Specifications | Intel
Intel® Core™ Ultra 9 Processor 285K (36M Cache, up to 5.70 GHz) quick reference with specifications, features, and technologies.

(Also: 110C max for Intel 3 vs 105C for N3B, The Intel 3 die is a 2+8 core style vs up to 8+16 for N3B)
..
At one point there were indications that Arrow Lake would have some chips on 20A.. but it looks like instead of using TSMC for all of Arrow Lake, they are using Intel 3.