Difference between two cells - excel-formula

Question

I intend to find difference between two cells use excel formula only.
Values in two cells are separated by comma. However, there is no space near the comma.
Assume in B2, the value is
apple pie,fish,cheese
And in B3, the value is
apple pie,cheese,fish,vegetables,banana
I have to get vegetables,banana in E2
I am thinking about use EXACT function
=exact(B2,B3)
However the result returns FALSE with no doubt as those values in two cells are not match exactly.
I also think to use MATCH function but the result is #N/A.
=MATCH(B2,B3,0)
For the result, what I need is to get
vegetables,banana
Is it possible to achieve this? Grateful for your advice please. Thank you.
Reference
Find the difference between two cells
Difference between two cells in third cell
I am sorry I made mistakes in my first version in this post, I expect the result is
vegetables,banana
If in javascript, (I just use as example to show what I try to do in the excel)
I can use something like this
Array.prototype.diff = function(x) {
return this.filter(function(y) {return x.indexOf(y) < 0;});
};
//to get the result
[apple pie,cheese,fish,vegetables,banana].diff([apple pie,fish,cheese])
//the result will return
vegetables,banana
So I would like to know is it possible to use excel formula to do that? Thank you very much.