Short answer: the Chrysler Pacifica (2016) is bigger — it is 1.4 cm0.6 in14 mm longer and 2.8 cm1 in28 mm wider than the Toyota Sienna (2020).

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Toyota Sienna vs Chrysler Pacifica

Toyota Sienna Fourth generation · 2020 · MinivanChrysler Pacifica minivan Chrysler Pacifica (RU) · 2016 · Minivanaligned at front bumper + ground · same scale
Toyota Sienna · 517.5 cm17 ft 0 in5,175 mmChrysler Pacifica · 518.9 cm17 ft 0 in5,189 mm Toyota Sienna · 177.6 cm5 ft 10 in1,776 mmChrysler Pacifica · 177.7 cm5 ft 10 in1,777 mm
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Toyota Sienna Fourth generation2020–present · Minivan
Length517.5 cm17 ft 0 in5,175 mm1.4 cm0.6 in14 mm shorter
Width199.4 cm6 ft 7 in1,994 mm2.8 cm1 in28 mm narrower
Width incl. mirrors—no data
Height177.6 cm5 ft 10 in1,776 mm0.1 cm0.0 in1 mm lower
Wheelbase306.1 cm10 ft 1 in3,061 mm2.8 cm1 in28 mm shorter wheelbase
Ground clearance16.3 cm6 in163 mm 
Boot (seats up)—no data
Boot (seats folded)2,860 L US cu ft, converted1,119 L less boot space
Weight2,091 kg US curb weight127 kg heaviervaries by version
Length518.9 cm17 ft 0 in5,189 mm1.4 cm0.6 in14 mm longer
Width202.2 cm6 ft 8 in2,022 mm2.8 cm1 in28 mm wider
Width incl. mirrors—no data
Height177.7 cm5 ft 10 in1,777 mm0.1 cm0.0 in1 mm taller
Wheelbase308.9 cm10 ft 2 in3,089 mm2.8 cm1 in28 mm longer wheelbase
Ground clearance—no data
Boot (seats up)—no data
Boot (seats folded)3,979 L US cu ft, converted1,119 L more boot space
Weight1,964 kg US curb weight127 kg lightervaries by version

Dimensions may vary by trim, market and model year. For guidance only — check with the manufacturer before you buy. Sources are listed on each car's page.

Toyota Sienna (2020) vs Chrysler Pacifica (2016): the differences

Will they fit? UK parking bay and garage

CarParking bay 4.8 × 2.4 mSingle garage, 7 ft door
Toyota Sienna (2020)Doesn't fitDoesn't fitcheck my garage
Chrysler Pacifica (2016)Doesn't fitDoesn't fitcheck my garage

Assumes a UK standard parking bay of 4.8 × 2.4 m and a typical UK single garage of 4.8 × 2.4 m inside (2.1 m high) with a 7 ft × 6 ft 6 in (213 × 198 cm) up-and-over door. Where we have no width-with-mirrors figure we add 20 cm to the body width. “Comfortably” leaves about 60 cm to walk round and open a door; “tight” means it goes in but getting out is awkward. Garages and bays vary a lot — measure yours and use the garage fit checker. For guidance only.

See the full specifications and sources: Toyota Sienna (2020) · Chrysler Pacifica (2016). Dimensions may vary by trim, market and model year.