According to these two pages they both use the same vcore which ultimately is responsible for power consumption along with the clock:
https://www.pc-erfahrung.de/fileadmin/php-skripte/cpu_tabelle_info.php?ID=2313
https://www.pc-erfahrung.de/fileadmin/php-skripte/cpu_tabelle_info.php?ID=2320
Sadly the Intel ark does not specify this.
So I'd say measured per core it will bring you in a similar range. Since 2697 has 2 more cores it still will a little more energy.
At least this is my guess/assumption.
https://www.pc-erfahrung.de/fileadmin/php-skripte/cpu_tabelle_info.php?ID=2313
https://www.pc-erfahrung.de/fileadmin/php-skripte/cpu_tabelle_info.php?ID=2320
Sadly the Intel ark does not specify this.
So I'd say measured per core it will bring you in a similar range. Since 2697 has 2 more cores it still will a little more energy.
At least this is my guess/assumption.