The Masakari "should" have approximately 20% more armor (and internal) damage capacity over the Nova Cat.
The canon Masakari has 8.5 tons of internal structure + 13.5 tons of Clan Ferro-Fibrous armor (16.2 tons equivalent) giving it a total of 24.7 tons of damage capacity
The canon Novacat has 7 tons of internal structure + 13.5 tons of standard armor giving it a total of 20.5 tons of damage capacity.
Masakari has the same speed as the Novacat at 64kph, however, as seen with the Madcat, the devs could decide to dump its engine down from the 340 XL to a 300 XL, dropping its speed to ~58kph and freeing up ~5 tons. Though, that would mean the engine could hold 1 less double heat sink. Not a bad exchange considering the extra tonnage could be used to mount a.) heavier ballistic weapons which run cooler, or b.) more double heat sinks or special equipment assuming it isn't a gross deflection from the space consideration of CBT.
Such a mech would look something like this.
Masakari Chassis 85 tons
Internal Structure = 8.5 tons
300 XL Engine = 9.5 tons
Gyroscope = 3 tons
Cockpit = 3 tons
Armor = 13.5 tons (FF)
Remaining Tonnage = 47.5 tons
Prime
2 CERPPCs - RA = 7(14) tons
2 CERPPCs - LA = 7(14) tons
1 CLRM10 - LT = 3.5 tons (1 ton of ammunition included)
15 Double Heat Sinks = 15 tons
EOptics = 1 tons???
A
1 CERLBL - RA = 4 tons
1 CLB10X - RA = 11 tons (1 ton of ammunition included)
1 CERLBL - LA = 4 tons
1 CLB10X - LA = 11 tons (1 ton of ammunition included)
1 CLRM15 - LT = 4.5 tons (1 ton of ammunition included)
1 CSSRM6 - RT = 4 tons (1 ton of ammunition included)
4 Free Tons
5 Double Heat Sinks = 5 tons
B
1 CGauss Rifle - RA = 13 tons (1 ton of ammunition included)
2 CHLL - LA = 4( 8 ) tons
1 ATM9 - RT = 6 tons (1 ton of ammunition included)
1 NARC - LT = 3 tons (1 ton of ammunition included)
4 Free Tons
LAMS = 1.5 tons
12 Double Heat Sinks = 12 tons
C
1 CUAC20 - RA = 13 tons (1 ton of ammunition included)
2 CLPL - LA = 6 (12) tons
1 DSSRM6 - LT = 7 tons (1 ton of ammunition included)
4 Free Tons
LAMS = 1.5 tons
GECM = 1 tons
9 Double Heat Sinks = 9 tons