I also did a bunch of searches and found which Panasonic DVD recorders use which chips. Presumably the ones with matching video processors have the same comb filter performance. If you want to try searching the service manuals and whatnot yourself, they seem to consistently refer to the A/V processing chips as IC3001.

C1AB00000791:
DMR-E20 (3 in)
DMR-E30 (3 in)
DMR-HS2 (HDD, 3 in)
DMR-T3030 (HDD, 3 in)
DMR-T3040 (HDD, 3 in)

C1AB00001979:
DMR-E65 (3 in)
DMR-E75 (VCR, 2 in)
DMR-E85 (HDD, 3 in)
DMR-E95 (HDD, 3 in)
DMR-E500 (HDD, 3 in)
DMR-EH50 (HDD, 3 in)
DMR-EH55 (HDD, 3 in)
DMR-EH60 (HDD, 3 in)
DMR-ES10 (3 in)
DMR-ES15 (2 in)
DMR-ES20 (2 in)
DMR-ES25 (2 in)
DMR-EZ17 (2 in)
DMR-EZ27 (2 in)
DMR-T6070 (HDD, 3 in)

C1AB00002083:
DMR-EA38V
DMR-EH75VP
DMR-ES30VP
DMR-ES35V
DMR-ES40VP/VPC
DMR-ES45V (VCR, 2 in)
DMR-ES46V (VCR, 2 in)
DMR-EZ37V
DMR-EZ475V
DMR-EZ47V
DMR-EZ48VP/VPC
DMR-EZ485VP
SA-HT830VP/VPC
SA-HT833V

C1AB00002100 (PAL only?):
DMR-ES10EB/EBL/EC/EG/EP (UK, Ireland, other EU countries)

C1AB00002084 (PAL only?):
DMR-ES30VGN/VEC/VEE (VCR, 2 in)
DMR-ES35VEG/VEC (VCR, 2 in)
DMR-EZ48VEB (VCR, 2 in)

C1AB00002379 (PAL only?):
DMR-EH55EC/EP
DMR-EH56EG
DMR-EH65EE/GC/GCS/GN (Russia, etc.)
DMR-ES15EB/EBL/EP/EC/EG (UK, Ireland, other EU countries)
DMR-EX75EB/EC/EG (UK, other EU countries)
DMR-EX79EG
DMR-EX85EB/EG (UK, Germany)
DMR-EX768EB/EF/EC/EP (UK, France, other EU countries)