Insert should be a resistor - coil always has a resistor to reduce EMI (electromagnetic interference, so your radio still can pick up a station). It looks like the new coil has internal resistor, so you don't see it in the spring.
Total resistance is not important (well, if it is 10 times off, then you may have a problem). Manufacturer may have chosen slightly higher voltage and slightly higher resistance - so the spark current is the same. +/- 30% should not matter, unless you are a racer. Repeatability is more important - if all readings are the same, it indicates good, repeatable and well controlled production process, which usually means better product quality.
Bottom line - don't worry.