Compare 2 columns and highlight differences

This should be easy and I HAD it working. I need to compare columns on 2 sheets: E in the first sheet to A in the second sheet. If either sheet has a value that's not found in the other sheet, I need to highlight it bright pink. I'm attaching a very simplified workbook that I've been playing with. Cons Inquiry is the first sheet, with data in E; Roster of trailer is the second sheet, with data in A; Sheets 3 and 4 show what I want to end up with. In real life, the sheets are in 2 different workbooks, though.

I had this macro working on this small sample within 1 workbook (thought I'd start simple). But when I tried to adapt it to work on 2 different books, it failed. Now I've tried so many different things that I can't even remember how I had it when it worked! I either wind up with highlighting on only 1 of the sheets - both A and E, or no highlighting at all.

Can anyone see what (no doubt is some stupid thing) I've overlooked? I'm feeling like a dunce; been working on this for over 4 hrs!

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Thanks,

Jenny