Where does the difference in tonnage come from? (nvm, found it)

[martinuzz (OP)]

I just pressed copy on this ship:

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Hollow (Spark) class Stealth Carrier    45,000 tons     845 Crew     12191.9 BP      TCS 135  TH 960  EM 0
6666 km/s     Armour 1-112     Shields 0-0     Sensors 1/1/0/0     Damage Control Rating 78     PPV 0
Maint Life 1.53 Years     MSP 8128    AFR 337%    IFR 4.7%    1YR 3929    5YR 58931    Max Repair 4050 MSP
Intended Deployment Time: 12 months    Flight Crew Berths 310    
Hangar Deck Capacity 15000 tons    

1200 EP Inertial Fusion Stealth EcoDrive (5)    Power 1200    Fuel Use 7.31%    Signature 192    Exp 7%
Fuel Capacity 6,690,000 Litres    Range 366.0 billion km   (635 days at full power)

Cloaking Device: Class cross-section reduced to 15% of normal
Strike Group
30x Spark Beam Fighter   Speed: 38400 km/s    Size: 10

This design is classed as a Military Vessel for maintenance purposes

And that got me this ship:

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Hollow (Wisp) class Stealth Carrier    44,300 tons     845 Crew     12048.1 BP      TCS 132.9  TH 960  EM 0
6772 km/s     Armour 1-111     Shields 0-0     Sensors 1/1/0/0     Damage Control Rating 78     PPV 0
Maint Life 1.55 Years     MSP 8159    AFR 327%    IFR 4.5%    1YR 3871    5YR 58063    Max Repair 4050 MSP
Intended Deployment Time: 12 months    Flight Crew Berths 0    
Hangar Deck Capacity 15000 tons    

1200 EP Inertial Fusion Stealth EcoDrive (5)    Power 1200    Fuel Use 7.31%    Signature 192    Exp 7%
Fuel Capacity 6,690,000 Litres    Range 371.9 billion km   (635 days at full power)

Cloaking Device: Class cross-section reduced to 15% of normal
Strike Group
30x Spark Beam Fighter   Speed: 38400 km/s    Size: 10

This design is classed as a Military Vessel for maintenance purposes

I changed nothing. In design view, the original has 6.3 Biphase Carbide Armor, and the copy has 6.2 Biphase Carbide Armor.
So they have the same armor tech. (Although I am researching the next tech level at the current time).

Where does the 700 ton difference come from? Like I say, I really did do anything except press the copy design button.

I experimented by trying the new armour button on both the original as well as the copy, to no effect. I gave both a point of armor, and took it out again. Again, no change, still 700 ton difference.

Is there a hidden factor over time that allows for the construction of smaller ships? The original design was made a decade ago..

EDIT: I did get better shipbuilding rate construction tech, would that matter? Although that still would not explain that I can't get the old design to match the copy.

EDIT2: I found it. Pressing the copy button turns off the 'keep spare berths' option. It has less flight crew

[Narmio]

Good catch! It's not exactly serious, but you should bugrep that anyway.