Accepted role but 2 interviews to go

I just this morning accepted an EO role with an estimated start date end May. I have my HEO interview this week and an EO role interview in 2 weeks time (dream role). What do I do if I land the role, does it look bad that I've accepted and now not starting? I'm more keen on the EO role in 2 weeks time as it would be my dream field and also don't mind this HEO role as its more pay.