Date registered: May 2017
Vehicle: 1983 380 SL
Location: Long Island, New York USA
Mentioned: 16 Post(s)
Quoted: 759 Post(s)
You're posting DC resistance values... a positive determination cannot be made simply by checking DC resistance. However, it goes heavily in your favor that the engine ran using the Hitachi coil.
The Hitachi primary has twice the DC resistance as the original. In a DC circuit this will result in half the current. This could mean nothing or it could be a game changer. It could be higher because the gauge of the wire is thinner, or because the gauge is the same but the primary is made of a much longer length... more turns.
Having said that... the primary is being turned on and off by the "switching unit" and being that it is switching fewer amps, all things being equal my best guess would be that you'll be OK using the Hitachi coil for now but replace it with the original or equivalent part ASAP.
Nobody gets out of this life alive.