Which 2005 Silverado is closest to 2006 Silverado

[want2learn]

This might sound like a ridiculous question, but which 2005 Silverado is closest to the 2006 Silverado 1500 4.3V (X) 2WD, in terms of the engine and drivetrain (not the body). I happened to be able to look at the eSI, and don't see a choice for 2005 Silverado 1500. The eSI didn't go up to 2006. These are the choices that I see for 2005 Chevy (obviously only a few are silverados):

 

Astro - 2WD

Astro - 4WD

Avalanche - 2WD

Avalanche - 4WD

AveoBlazer - 2WD

Blazer - 4WD

Cavalier

Chevrolet T-Series Medium Duty Truck F6/F7/F8

Chevy C Silverado - 2WD

Chevy C Silverado - 2WD (CNG)

Chevy K Silverado - 4WD

Chevy K Silverado - 4WD (CNG)

Chevy MD Steel Tilt (W Model)

Chevy Suburban - 2WD

Chevy Suburban - 4WD

Classic

Colorado Pickup - 2WD

Colorado Pickup - 4WD

Corvette

Epica

Equinox

Express

Express – AWD

Impala

Kodiak C-Series (Conventional) C4/C5

Kodiak C-Series (Conventional) C6/C7/C8

Malibu

Monte Carlo

Optra

SSR

Tahoe - 2WD

Tahoe - 4WD

TrailBlazer - 2WD

TrailBlazer - 4WD

Venture

Venture - 4WD

Vivant