How to change my mac?

I am building my OC flash drive and everything. My hardware is Haswell-age-old. In the tutorial I'm following it says with dGPU I have to rename the type of mac to iMac 15,1.

TLDR: Can I use Mac Pro 6.1 2013 instead of iMac 15,1? What's the difference if it's iMac 15,1 or something else?

Thanks and sorry if it's dumb question, but can't construct a proper question for google :)

submitted by /u/binarybonannza
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