may i summarise and say that igual de... que is used for non quantity or another way, quality comparisons only? for example, we can use tanto... como for 'tiene tanto dinero como yo', but we cant use it with igual de. non quantity or quality comparisons which are adjectives, adverbs.
Igual de is not used with countable nouns - you can do something like this though:
Yo tengo una cantidad igual de caramelos que mi hermano.
I have the same quantity of sweets as my brother.
Although this wouldn't sound very natural.
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