The short answer is 'yes': aside from naming and adding more 'realms' of magic, I've made more or less subtle changes to what 'realms' are. It takes a score of pages (font 12) in my world document to explain them all, so I won't post them here but the main difference is that 'realms' are to me truly sources of magical power, so there's no difference between what a 'realm' allows compared to another: each and any spell (list) can be equally cast by someone of the same proficiency (i.e. pure, hybrids or semi) even from different realms. What changes is merely how this spell is fuelled, like how electricity can be used the same, regardless it was created from solar energy, wind generators, or water dams. As a consequence, all open lists are put together as 'open list' while all closed lists are put together as 'closed list' and anyone from any realm can freely choose his lists among them.
As a direct consequence of 'realms' being 'sources of magic', how much a spell user can use at a given instant depends on his ability to draw magical energy from his 'source of magic'. For instance, Essence being essentially raw magical energy having been 'processed' (and rejected) into usable magical energy by living beings, how much magical power an Essence spellcaster has at his disposal in a given location depends on the density of living beings around him --so Essence spellcaster are all powerful in cities and pretty useless in desert areas. OTOH, Personal Magic (aka RM2 'Mentalism') being essentially raw magical energy having been 'processed' (and rejected) into usable magical energy by the spellcaster according to one condition affecting his self-processing ability, how much magical power a Personal mage has at his disposal at a given time depends on how 'motivated' he is in his 'motivation source' --so the more filled with hatred a Personal mage fuelled by hatred is, the more powerful he is; the more filled with curiosity a Personal mage fuelled by curiosity is, the more powerful he is.
While a hybrid spellcaster loses his privilege to pick spell lists from two realms more easily than pure spellcasters, they gain the privilege of possibly drawing magical power from two sources, which is a notable ability. For instance, whereas jailing an Essence spellcaster in a (large enough) cemetery with no dwelling around (i.e. a tiny graveyard in the middle of a major city wouldn't work) would pretty much incapacitate him (and even sicken him due to withdrawal effects), jailing there an Essence/Divine spellcaster wouldn't work much if he's still able to receive the magical energy his god sends him.