Are these the same chair?

Effectively yes. Both are the Aeron in Size B with PostureFit SL back support. The Remastered is the 2016 redesign; the other listing uses the same PostureFit name but its description also calls the chair Classic, so check which generation you are getting.

Which is better for long workdays?

Both. The 8Z Pellicle mesh and PostureFit SL are built for full-day sitting. The Remastered adds the option of adjustable lumbar and more arm configurations, which helps if you share the chair or sit in several postures.

The Remastered carries Herman Miller's 12-year warranty on the frame and mesh. The older Classic is also durable but is out of production, so replacement parts and service are harder to find.

Is the Remastered worth stepping up to?

Yes if you want the current build, the full arm and lumbar options and the longest parts support. If the other listing already matches your arm and tilt needs, the difference in daily use is small.

Size B suits most adults from about 5'2" to 6'0" and up to roughly 350 lbs. Very tall or heavy users should look at Size C; very small users at Size A.

Does either have a headrest?

No. Neither ships with a headrest, and Herman Miller does not offer one as a factory option. Third-party headrests attach to the frame.

Herman Miller Aeron Remastered vs Herman Miller Aeron Size B

Both are the same chair: the Aeron in Size B with PostureFit. The Remastered is the 2016 redesign, with 8Z Pellicle in eight tension zones, the Harmonic 2 tilt and a higher recycled content. The listing labeled "Aeron Size B with Posturefit" describes the same PostureFit SL back support, so the real choice is condition and configuration, not model. Buy the Remastered for the current build and the longest parts support; buy the other only if its exact arm and tilt options match what you need.

Choose the Aeron Remastered if you want the current-generation chair with PostureFit SL, the Harmonic 2 tilt and the widest range of arm and lumbar configurations.
Choose the Aeron Size B with PostureFit if its listed arm and tilt options fit you and you are fine with the same Size B fit and PostureFit SL support.

Prices

Herman Miller Aeron Remastered: $650.00 at Bygone Icons (checked today)
Herman Miller Aeron Size B: $600.00 at Grandeur99 (checked today)
Difference: the Herman Miller Aeron Size B is $50.00 cheaper than the Herman Miller Aeron Remastered today

	Herman Miller Aeron Remastered	Herman Miller Aeron Size B
Generation	Remastered, the 2016 redesign of the Aeron	Listed as Aeron Size B with PostureFit; the description calls it the Classic
Back support	PostureFit SL, adjustable lumbar, or Pellicle only	PostureFit SL
Seat and back mesh	8Z Pellicle with eight tension zones	8Z Pellicle with eight latitudinal zones
Tilt	Harmonic 2 tilt; tilt limiter optional	Harmonic 2 tilt with limiter and forward tilt
Arm options	Fully adjustable, height with pivot, height only, fixed, or no arms	Adjustable armrests
Size range	One chair in sizes A, B and C; Size B fits most adults	Size B only
Weight capacity	Up to 350 lbs	About 350 lbs (159 kg)
Recycled content	Over 50% recycled materials, including ocean-bound plastic	Not stated

Spec	Herman Miller Aeron Remastered	Herman Miller Aeron Size B
Height	41 inches / 104.14 cm	36.75–41.13"
Width	27 inches / 68.58 cm	28.3–30.4"
Depth	16.75 inches / 42.55 cm	27.5–28.3"
Seat Height	20.5 inches / 52.07 cm	14.8–22.8"
Release Year	2016	—
Height Capacity	4’8”—6’7”	—
Weight Capacity	Up to 350 lbs	—
Suspension Material	8Z Pellicle	—
Back Support	PostureFit SL, Adjustable Lumbar Support, Pelli…	—
Tilt Mechanism	Harmonic 2 Tilt	—
Armpad Adjustment	Fully Adjustable, Height with Pivot, Height Adj…	—
Weight (Size B)	38.9 lbs	—

Spec	Herman Miller Aeron Remastered	Herman Miller Aeron Size B
Seat Depth	—	17"
Arm Height	—	7.5–11.5"
Max Capacity	—	159 kg
Product Weight	—	18.1 kg
Back Rest Height	—	578 mm
Seat Width	—	514 mm
Material	—	8Z Pellicle Suspension with 8 Latitudinal Zones
Tilt	—	Harmonic™ 2 Tilt, Tilt limiter and forward tilt

Herman Miller Aeron Remastered vs Herman Miller Aeron Size B

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Herman Miller Aeron Remastered vs Herman Miller Aeron Size B

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Herman Miller Aeron Remastered

Herman Miller Aeron Size B

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Herman Miller Aeron Remastered

Herman Miller Aeron Size B

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Herman Miller Aeron Remastered

Herman Miller Aeron Size B

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Herman Miller Aeron Remastered

Herman Miller Aeron Size B

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