Yes, ephedrine.HCl is less soluble in alcohol than pseudoephedrine.
Nevertheless any anhydrous alcohol will work just fine for extraction, hot alcohol will work better than cold alcohol and extracting by using several single portions of alcohol works better than using a large amount of alcohol for once.
Hot IPA is fine - cold IPA is not good as the solubility differs very much from cold to hot. You may soak it as long as you want but heat it up before filtering and do three hot extractions - more is nonsense, less a waste.