Here's a basic comparison of basic world generation in the various editions of Traveller.

In CT:

World size = 2d-2

Atmosphere = 2d-7+world size

(if world size=0, then atmosphere=0)

Hydrographics = 2d-7+atmosphere

(if world size is 1 or less, hydrographics =0;

if atmosphere is 1 or less, or A or more, apply a DM of -4)

In MT (and LBB6):

World size = 2d-2

Atmosphere = 2d-7+world size

(if world size=0, then atmosphere=0)

Hydrographics = 2d-7+world size

(if world size is 1 or less, hydrographics =0;

if atmosphere is 1 or less, or A or more, apply a DM of -4)

In TNE:

World size = 2d-2

Atmosphere = 2d-7+world size

(if world size=0, then atmosphere=0)

Hydrographics = 2d-7+world size

(if world size is 1 or less, hydrographics =0;

if atmosphere is 1 or less, or A or more, apply a DM of -4)

In T4:

World size = 2d-2

Atmosphere = 2d-7+world size

(if world size=0, then atmosphere=0)

Hydrographics = 2d-7+atmosphere

(if world size is 1 or less, hydrographics =0;

if atmosphere is 1 or less, or A or more, apply a DM of -4)

In T20:

World size = 2d-2

Atmosphere = 2d-7+world size

(if world size=0, then atmosphere=0)

Hydrographics = 2d-7+atmosphere

(if world size is 1 or less, hydrographics =0;

if atmosphere is 1 or less, or A or more, apply a DM of -4)

So it's an even split. Three versions of Traveller World creation use:

Hydrographics = 2d-7+atmosphere (CT, T4, T20),

and three use

Hydrographics = 2d-7+world size (LBB6, MT, TNE).

I know it doesn't help any