إئاً expresses time like' when' which in Arabic 'حين'. إذن used between two present verbs, the verb next to إذن will happen after the verb before it. and actually happening of the verb after it depends on the happening of the verb before it.

إذا it's like if .. If you win you will be happy .. إذا فزت ستكون سعيداً .. إذن ==> -هل ستحضر المباراة ؟ - نعم - إذن سأحضرها معك .. -Do you will watch the game - yes . - okay then I'll watch it with you ( so also is close to إذن meaning ). So you knew that he took my car and you didn't tell me. إذن كنت تعلم أنه أخذ سيارتي ولم تعلمني يذلك

We use إذا as a conditional conjunction like “ if” in English. إذا فهمت المثال فاكتب لي رسالة If you have understood this example, send me a message! We use إذن as a conjunction meaning the consequences . You have understood this lesson, so you can/ have to do ……. .

لا فرق بينهما يمكنك كتابتها بالشكلين فكلاهما صحيح ولا فرق أبدا بينها