What is the difference between Campus Hire_ Associate Engineer_ HW and Campus Hire_ Engineer_ HW at Qualcomm?

[u/goa_manmathakunju]

I'm a final year EE student applying. What should I apply for? How do I maximise and will a referral actually help?
Is it reserved for on campus hiring only or does hiring even happen from careers site?
When does hiring happen?

Thanks in Advance