Welcome to Android Central! Not necessarily. There can be various nuances to each device. Ultimately, it's up to the manufacturer and the wireless carrier to decide.
Thanks for the clearing my doubt. Again I want to ask regarding the same as where can I get the maximum upgradable OS information for all the google devices?
I don't believe there's a master list anywhere. If you have questions about official system updates (i.e., not custom ROMs) for a specific device, contact the manufacturer as well as the carrier.