The primer on the Continental shoves fuel in just above the carb throat(150).Overpriming allows neat fuel to dribble out of the carb onto the floor and is a recipe for a carb fire.If a fire starts dont stop cranking or the whole shebang will go up.Keep cranking and it will suck the fire into the carb and actually put it out!
The primer on the Lycoming (152) is injected direct into the cylinder head behind the inlet valve which is safer but more prone to flooding hence the different technique.
Also be aware that the Continental system will lead to a pool of raw fuel laying in the inlet spider if overprimed,this then leads to the engine sucking in a huge gob of raw fuel when it fires which makes the engine rich cut.This then confuses the hapless pilot who thinks it stopped from lack of fuel and proceeds to prime some more and make the whole situation worse!
If you suspect it is overprimed,open throttle fully,stand on the brakes,mixture FULLY lean and crank.Close the throttle SLOWLY as it fires.(If you shove it in it injects fuel via the accelerator pump in the carb).
The position of the throttle has no bearing on priming on either engine.