What is the difference between different generation processors with the same clock speed when talking about PHP code execution?

  cpu, optimization, performance, php, processors

I am currently in my final year of a compsci uni course, and am doing a web dev module.

We have to write a PHP script to process a large data file and our score is based on our benchmarked time.

My PC has an i5-4460 @ 3.4GHz.
The benchmark PC has an i3-4130 @ 3.4GHz.

Will the code be a similar execution time across both of them? Or will the i3 perform slower.

Just want to get an idea of the time I can expect on the benchmarking system so I can optimise further if needed.

Thanks in advance.

Source: Ask PHP