In case you didn't understand the other reply, you can't use newtons in this context. Kilograms is perfectly fine here. The thrust of the engine can (and should) be measured in newtons though.

Also, 4 decimal points of precision is completely overkill. Maybe one decimal point at most would be more than enough, but most wouldn't even bother with that.

The problem is the 8 significant figures, not 4 decimal places - 0.3300 kip and 1467.9126 N both have 4 decimal places but one is much worse than the other.

Even if 330 lb was exact, all those digits in 1467.9126 N aren't even correct. It should be 1467.9131 N using standard gravity. It looks like brudgers used 1 lbf = 4.44822 N which is what Google says but is only rounded to 6 s.f. so can't be used to generate an 8 s.f result.

> The thrust of the engine can (and should) be measured in newtons though.

It's very common to measure engine thrust in ton-force because it makes it easy to compare the thrust to the weight of the rocket, which is a critical metric.

The force of a rocket engine can be measured in pounds.

And pressure in PSI and torque in foot-lbs because pounds are a unit of weight (i.e. force) not mass.