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Dual booting 2 OS X Versions

Joined
Oct 6, 2015
Messages
38
Motherboard
MSI MS-7372 v1.0
CPU
Core 2 Duo E8400
Graphics
Nvidia Geforce 730 2GB GDDR5
Mac
Mac Pro
Mobile Phone
iOS
Hi guys, I'm running 10.11.5 on my 500gb HDD and I have a spare HDD laying around in my cabinet.

Is it possible to install 10.9.5 on the other using the same serial, MLB and ROM values on my working El Capitan? Is it going to have an effect on apple's database devices (appleid.apple.com)?

I just want the old look of OS X because I'm more used to it than the new UI of OS X started in Yosemite. Thanks in advance!
 
Joined
Oct 6, 2015
Messages
38
Motherboard
MSI MS-7372 v1.0
CPU
Core 2 Duo E8400
Graphics
Nvidia Geforce 730 2GB GDDR5
Mac
Mac Pro
Mobile Phone
iOS
What will be the effect on apple servers?
 
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