Generally, what is difference between noun + gerund and gerund + noun? For example, writing English and English writing.
'Writing' can be used as both a noun and a verb. 'English' can be used as both a noun and an adjective.
'Writing English' is a verb-noun phrase which refers to the act of writing words in the English language
I looked over Jackie's shoulder. She was writing English, why couldn't I understand it?
'English writing' is an adjective-noun phrase which refers to written words that were written in English.
English writing was engraved in the wall.
There are other, more unusual ways you could combine these words (for example, if you use 'English' as a noun referring to residents of England, you could use 'English writing' as a noun-verb phrase referring to a number of England's residents putting words on paper), but the two above are the most common.