No , it's not.

Last digit in the code indicates engine's version. So, the initial versions when launched are always coded with number "0". Upgrades that follow in the futue are coded with higher numbers eg 1, 2, 3 etc

The N64 will definitely have number "0" at the end of the code.

Also the last letter in the code indicates engine's power output.

T = highest power output
O = high power output
M = medium power output
U = low power output
K = lowest power output

So, don't be so sure the could is N64B44O1.

N = new generation engine model (M = standard current version; S = sports M engines )

6 = code for number of cylinders (4 = 4cyl, 5 = 6cyl, 6 = 8cyl, 7 = 12cyl, 8 = 10cyl)

4 = type of the engine (1 = SULEV/PZEV, 2 = Double Vanos + Valvetronic, 3 = petrol with direct injection, 4= petrol with direct injection + turbochargers, 5 = Double Vanos without Valvetronic, 7 = diesel + turbochargers)

B = fuel type (B = petrol, D = diesel, H = hydrogen, G = natural gas, E = electricity)

44 = engine displacement in deciliters (44 = 4.4L, 30 = 3.0L, 20 = 2.0L etc)