Proper Coil

I see 3 coils available for my 69 /6 I do not want the 3.3 ohm primary res. coil as I am not going to bypass the ballast. Parts C819 and C838 (Wells) both have 1.5 ohm pr. resistance. however the secondary. resistance values differ. The C819 is 9.9k ohm, and the C838 is 8k Ohm. Whats the difference and the consequences if any?